QUESTION: Math problem: Solve -146*n + 8904 = 9780 for n.
ANS: -6
QUESTION: Math problem: Solve 555*r + 2066 + 4594 = 0 for r.
ANS: -12
QUESTION: Math problem: Solve -671*k - 104 = -658*k for k.
ANS: -8
QUESTION: Math problem: Solve 0 = 20*f - 30*f - 30 for f.
ANS:
-3