QUESTION: Math problem: Solve 4*v = 9*v - 20 for v.
ANS: 4
QUESTION: Math problem: Solve 6*f + 10 = 4*f for f.
ANS: -5
QUESTION: Math problem: Solve -255*m = -257*m + 2 for m.
ANS: 1
QUESTION: Math problem: Solve 23 = -14*d - 5 for d.
ANS:
-2