QUESTION: Math problem: Solve -161 = -7*z - 259 for z.
ANS: -14
QUESTION: Math problem: Solve 0 = 18*x + 58 + 86 for x.
ANS: -8
QUESTION: Math problem: Solve 11*r - 15 = 29 for r.
ANS: 4
QUESTION: Math problem: Solve -81*a = 404*a - 3570 + 2600 for a.
ANS:
2