QUESTION: Math problem: Solve 0 = -5*f + 6*f - 5 for f.
ANS: 5
QUESTION: Math problem: Solve -3*z = -29*z + 917 - 1229 for z.
ANS: -12
QUESTION: Math problem: Solve 241*k - 247*k = -30 for k.
ANS: 5
QUESTION: Math problem: Solve 38*k + 112 = 52*k - 30*k for k.
ANS:
-7