QUESTION: Math problem: Solve -51 = -23*f + 18 for f.
ANS: 3
QUESTION: Math problem: Solve -6*n + 8 - 14 = 0 for n.
ANS: -1
QUESTION: Math problem: Solve 47*r + 74 = 27 for r.
ANS: -1
QUESTION: Math problem: Solve -82826*l - 180 = -82781*l for l.
ANS:
-4