QUESTION: Math problem: Solve -426*r - 297*r = 106*r - 26*r + 4015 for r.
ANS: -5
QUESTION: Math problem: Solve 399*k + 26202 = 16404 - 41462 - 2605 for k.
ANS: -135
QUESTION: Math problem: Solve 4*a + 101 = 117 for a.
ANS: 4
QUESTION: Math problem: Solve -9 = -b - 16 for b.
ANS:
-7