QUESTION: Math problem: Solve 24*r - 528*r + 25*r - 17639 = 90*r for r.
ANS: -31
QUESTION: Math problem: Solve -69238 = -1705*z - 1651*z - 300802 for z.
ANS: -69
QUESTION: Math problem: Solve 147 - 143 = -u for u.
ANS: -4
QUESTION: Math problem: Solve 136*u + 179 - 1690 = 1073 for u.
ANS:
19