ArithMeths.__neg__: explicitly call Mul for efficiency
ArithMeths.__neg__: explicitly call Mul for efficiency

        %timeit a=-x

old:    64.3 µs
new:    24.5 µs

toolforger/sympy,Vishluck/sympy,yashsharan/sympy,jaimahajan1997/sympy,debugger22/sympy,lidavidm/sympy,Titan-C/sympy,liangjiaxing/sympy,Mitchkoens/sympy,meghana1995/sympy,sahmed95/sympy,wyom/sympy,abhiii5459/sympy,jerli/sympy,AunShiLord/sympy,atreyv/sympy,atsao72/sympy,jerli/sympy,Mitchkoens/sympy,cswiercz/sympy,hargup/sympy,jaimahajan1997/sympy,Davidjohnwilson/sympy,shikil/sympy,wyom/sympy,saurabhjn76/sympy,AunShiLord/sympy,debugger22/sympy,farhaanbukhsh/sympy,debugger22/sympy,asm666/sympy,sampadsaha5/sympy,meghana1995/sympy,farhaanbukhsh/sympy,ChristinaZografou/sympy,jamesblunt/sympy,postvakje/sympy,garvitr/sympy,cswiercz/sympy,kaushik94/sympy,wanglongqi/sympy,kumarkrishna/sympy,Sumith1896/sympy,shipci/sympy,drufat/sympy,pbrady/sympy,maniteja123/sympy,kmacinnis/sympy,minrk/sympy,shikil/sympy,ahhda/sympy,Vishluck/sympy,cccfran/sympy,Curious72/sympy,ga7g08/sympy,Sumith1896/sympy,ChristinaZografou/sympy,atsao72/sympy,moble/sympy,bukzor/sympy,Davidjohnwilson/sympy,madan96/sympy,MridulS/sympy,sunny94/temp,rahuldan/sympy,Mitchkoens/sympy,jamesblunt/sympy,grevutiu-gabriel/sympy,MechCoder/sympy,sahmed95/sympy,grevutiu-gabriel/sympy,emon10005/sympy,vipulroxx/sympy,kmacinnis/sympy,mcdaniel67/sympy,Arafatk/sympy,sahmed95/sympy,hargup/sympy,pbrady/sympy,kevalds51/sympy,VaibhavAgarwalVA/sympy,flacjacket/sympy,madan96/sympy,oliverlee/sympy,skirpichev/omg,Shaswat27/sympy,sahilshekhawat/sympy,hrashk/sympy,mattpap/sympy-polys,lindsayad/sympy,vipulroxx/sympy,kumarkrishna/sympy,oliverlee/sympy,jbbskinny/sympy,hazelnusse/sympy-old,skidzo/sympy,beni55/sympy,yashsharan/sympy,kaichogami/sympy,mafiya69/sympy,abloomston/sympy,bukzor/sympy,chaffra/sympy,ChristinaZografou/sympy,rahuldan/sympy,ga7g08/sympy,moble/sympy,AkademieOlympia/sympy,abloomston/sympy,Shaswat27/sympy,skidzo/sympy,rahuldan/sympy,ga7g08/sympy,jamesblunt/sympy,Gadal/sympy,VaibhavAgarwalVA/sympy,amitjamadagni/sympy,tovrstra/sympy,Arafatk/sympy,moble/sympy,toolforger/sympy,sahilshekhawat/sympy,cccfran/sympy,VaibhavAgarwalVA/sympy,atreyv/sympy,KevinGoodsell/sympy,emon10005/sympy,maniteja123/sympy,atreyv/sympy,AkademieOlympia/sympy,sunny94/temp,souravsingh/sympy,Shaswat27/sympy,hrashk/sympy,fperez/sympy,lidavidm/sympy,kumarkrishna/sympy,asm666/sympy,ahhda/sympy,souravsingh/sympy,yukoba/sympy,MechCoder/sympy,sampadsaha5/sympy,toolforger/sympy,liangjiaxing/sympy,lindsayad/sympy,lindsayad/sympy,Titan-C/sympy,diofant/diofant,asm666/sympy,liangjiaxing/sympy,minrk/sympy,farhaanbukhsh/sympy,mafiya69/sympy,dqnykamp/sympy,amitjamadagni/sympy,dqnykamp/sympy,kaichogami/sympy,hrashk/sympy,jbbskinny/sympy,emon10005/sympy,Designist/sympy,kaushik94/sympy,yukoba/sympy,shikil/sympy,pbrady/sympy,jaimahajan1997/sympy,aktech/sympy,kaichogami/sympy,MridulS/sympy,Davidjohnwilson/sympy,bukzor/sympy,postvakje/sympy,ahhda/sympy,sahilshekhawat/sympy,Curious72/sympy,atsao72/sympy,madan96/sympy,MridulS/sympy,jerli/sympy,abloomston/sympy,pandeyadarsh/sympy,lidavidm/sympy,dqnykamp/sympy,drufat/sympy,souravsingh/sympy,saurabhjn76/sympy,Curious72/sympy,meghana1995/sympy,ryanGT/sympy,Designist/sympy,Arafatk/sympy,skidzo/sympy,beni55/sympy,mcdaniel67/sympy,mcdaniel67/sympy,chaffra/sympy,iamutkarshtiwari/sympy,cccfran/sympy,iamutkarshtiwari/sympy,Gadal/sympy,Titan-C/sympy,shipci/sympy,sampadsaha5/sympy,postvakje/sympy,drufat/sympy,vipulroxx/sympy,abhiii5459/sympy,pandeyadarsh/sympy,AunShiLord/sympy,kaushik94/sympy,cswiercz/sympy,iamutkarshtiwari/sympy,kevalds51/sympy,srjoglekar246/sympy,maniteja123/sympy,garvitr/sympy,mafiya69/sympy,aktech/sympy,hargup/sympy,jbbskinny/sympy,wyom/sympy,Sumith1896/sympy,garvitr/sympy,kmacinnis/sympy,wanglongqi/sympy,Gadal/sympy,Designist/sympy,sunny94/temp,yashsharan/sympy,aktech/sympy,jbaayen/sympy,grevutiu-gabriel/sympy,pernici/sympy,AkademieOlympia/sympy,yukoba/sympy,shipci/sympy,wanglongqi/sympy,MechCoder/sympy,chaffra/sympy,Vishluck/sympy,oliverlee/sympy,pandeyadarsh/sympy,beni55/sympy,hazelnusse/sympy-old,kevalds51/sympy,saurabhjn76/sympy,abhiii5459/sympy