QUESTION: Math problem: Solve -561 = 29*s - 62*s for s.
ANS: 17
QUESTION: Math problem: Solve -15*a = 9*a - 30*a + 54 for a.
ANS: 9
QUESTION: Math problem: Solve -904 + 14 = 50*z - 139*z for z.
ANS: 10
QUESTION: Math problem: Solve -105 = 12*c - 9 for c.
ANS:
-8