QUESTION: Math problem: Solve 638*a + 144 = 650*a for a.
ANS: 12
QUESTION: Math problem: Solve 9*d = d + 5*d + 15 for d.
ANS: 5
QUESTION: Math problem: Solve 43*x = 37*x + 6*x + 111*x - 999 for x.
ANS: 9
QUESTION: Math problem: Solve 1052 = -352*k - 708 for k.
ANS:
-5