QUESTION: Math problem: Solve -161*r + 63 = -154*r for r.
ANS: 9
QUESTION: Math problem: Solve 37*u + 9 = 34*u for u.
ANS: -3
QUESTION: Math problem: Solve 11863*f - 11851*f + 864 = 0 for f.
ANS: -72
QUESTION: Math problem: Solve 13 - 11 = -j for j.
ANS:
-2