Remove unnecessary simplify from Line.equation()
Remove unnecessary simplify from Line.equation()

The call to simplify is not needed, and costs a lot of time.

before:
python -m timeit -n 1000 "from sympy import Line; l = Line([0,0],
[1,2])" "s = l.equation()"
1000 loops, best of 3: 7.64 msec per loop

after:
python -m timeit -n 1000 "from sympy import Line; l = Line([0,0],
[1,2])" "s = l.equation()"
1000 loops, best of 3: 358 usec per loop

Signed-off-by: Sergey B Kirpichev <6c6368f8f4cbabf33ffd2abfd270a2fcf839188a@gmail.com>

diofant/diofant,skirpichev/omg