QUESTION: Math problem: Solve -15*y + 6*y + 7*y = 0 for y.
ANS: 0
QUESTION: Math problem: Solve -10 = 9*r - 7*r for r.
ANS: -5
QUESTION: Math problem: Solve 0 = -3*r - 2 + 14 for r.
ANS: 4
QUESTION: Math problem: Solve 40*h + 36 = 4*h for h.
ANS:
-1