QUESTION: Math problem: Solve 0 = -o + 7*o + 12 for o.
ANS: -2
QUESTION: Math problem: Solve -107 = 4*a - 111 for a.
ANS: 1
QUESTION: Math problem: Solve 0 = -23*r + 9808 - 9509 for r.
ANS: 13
QUESTION: Math problem: Solve 2*s = s + 48 - 53 for s.
ANS:
-5