QUESTION: Math problem: Solve -2*r - 3*r = -16*r - 121 for r.
ANS: -11
QUESTION: Math problem: Solve -1793 = -413*v + 4815 for v.
ANS: 16
QUESTION: Math problem: Solve 5*q + 390 = 415 for q.
ANS: 5
QUESTION: Math problem: Solve -4200*u - 505 = -4301*u for u.
ANS:
5