QUESTION: Math problem: Solve 21 = -5*s + 12*s for s.
ANS: 3
QUESTION: Math problem: Solve -599 + 986 = 43*p for p.
ANS: 9
QUESTION: Math problem: Solve -78*v - 73*v + 2784 = 41*v - 105*v for v.
ANS: 32
QUESTION: Math problem: Solve -389*a - 6105 + 3030 = 5872 for a.
ANS:
-23