QUESTION: Math problem: Solve 39*f + f - f = -19*f + 1740 for f.
ANS: 30
QUESTION: Math problem: Solve -17*o + 50537 = 50656 for o.
ANS: -7
QUESTION: Math problem: Solve 30*s + 15*s + 30*s = 16*s - 1180 for s.
ANS: -20
QUESTION: Math problem: Solve 6*a = -a + 28 for a.
ANS:
4