QUESTION: Math problem: Solve 0 = 4*u - 6 + 18 for u.
ANS: -3
QUESTION: Math problem: Solve -12*c = 4*c - 48 for c.
ANS: 3
QUESTION: Math problem: Solve 125 = 687*c - 667*c - 95 for c.
ANS: 11
QUESTION: Math problem: Solve 0 = -46*x + 49*x - 21 for x.
ANS:
7