QUESTION: Math problem: Solve 0 = 5*r - 382 + 357 for r.
ANS: 5
QUESTION: Math problem: Solve -12*x + 6*x = 18 for x.
ANS: -3
QUESTION: Math problem: Solve 37*k + 220 = 81*k for k.
ANS: 5
QUESTION: Math problem: Solve 20*u + 306 - 755 + 69 = 0 for u.
ANS:
19