QUESTION: Math problem: Solve -13*f + 86*f - 716 - 525 = 0 for f.
ANS: 17
QUESTION: Math problem: Solve -239*r + 130*r - 589 - 174 = 0 for r.
ANS: -7
QUESTION: Math problem: Solve -334 = -2*x - 336 for x.
ANS: -1
QUESTION: Math problem: Solve -16*z - 372*z = 1164 for z.
ANS:
-3