QUESTION: Math problem: Solve -515*r - 7 = -516*r for r.
ANS: 7
QUESTION: Math problem: Solve 284 - 242 = -7*s for s.
ANS: -6
QUESTION: Math problem: Solve 23*f + 35*f = 281 + 67 for f.
ANS: 6
QUESTION: Math problem: Solve 94*j = 169015 - 170425 for j.
ANS:
-15