question: Teacher asked me this: Solve -63 = 412*x - 403*x for x.
++++++++++
answer: -7

question: Teacher asked me this: Solve 0*f - 576 = 28*f - 156 for f.
++++++++++
answer: -15

question: Teacher asked me this: Solve 80 = 55*s - 85 for s.
++++++++++
answer: 3

question: Teacher asked me this: Solve -52*o - 3341 - 3697 = 82*o + 4*o for o.
++++++++++
answer:
-51