question: Teacher asked me this: Solve -162*f + 312*f = 162*f - 156 for f.
++++++++++
answer: 13

question: Teacher asked me this: Solve -187*l + 196*l + 573*l - 29171 = -359*l for l.
++++++++++
answer: 31

question: Teacher asked me this: Solve 357*v + 1163 = -558*v - 248*v for v.
++++++++++
answer: -1

question: Teacher asked me this: Solve 0 = 16543116*u - 16543077*u + 3471 for u.
++++++++++
answer:
-89