QUESTION: Math problem: Solve -22*r + 9 = -25*r for r.
ANS: -3
QUESTION: Math problem: Solve -2005*x - 6868 = 29991 - 14282 + 19528 for x.
ANS: -21
QUESTION: Math problem: Solve 3*l - 10 = -7*l for l.
ANS: 1
QUESTION: Math problem: Solve -13 = -3*b + 8 for b.
ANS:
7