QUESTION: Math problem: Solve r + 4 = 4 for r.
ANS: 0
QUESTION: Math problem: Solve 587 = -75*k + 2087 for k.
ANS: 20
QUESTION: Math problem: Solve -61*h + 7055 = 198*h + 156*h for h.
ANS: 17
QUESTION: Math problem: Solve -397*y + 641*y + 244 = 0 for y.
ANS:
-1