Renamed numbers to exceptions in paranthesis_around_minus as that makes more sense now that it's not only numbers in the string.
Renamed numbers to exceptions in paranthesis_around_minus as that makes more sense now that it's not only numbers in the string.

MathGen/oppgavegenerator,w0pke/oppgavegenerator,w0pke/oppgavegenerator,w0pke/oppgavegenerator,MathGen/oppgavegenerator,MathGen/oppgavegenerator