QUESTION: Math problem: Solve 21 = -43*b + 46*b for b.
ANS: 7
QUESTION: Math problem: Solve 0 = -4*k + 161 - 157 for k.
ANS: 1
QUESTION: Math problem: Solve 0 = -75*l + 159*l + 88*l - 1548 for l.
ANS: 9
QUESTION: Math problem: Solve 0 = -6*o + 17*o + 77 for o.
ANS:
-7