QUESTION: Math problem: Solve -646 + 224 = 110*o + 678 for o.
ANS: -10
QUESTION: Math problem: Solve -4644 = 275*u - 794 for u.
ANS: -14
QUESTION: Math problem: Solve 7974 = 381*c + 65*c - 3*c for c.
ANS: 18
QUESTION: Math problem: Solve 123 = -31*z + 61 for z.
ANS:
-2