question: Teacher asked me this: Solve -3*f - 13*f = 0 for f.
++++++++++
answer: 0

question: Teacher asked me this: Solve 243*i + 32 - 132 = 143*i for i.
++++++++++
answer: 1

question: Teacher asked me this: Solve -10447 + 4534 = -58*q - 2*q - 5193 for q.
++++++++++
answer: 12

question: Teacher asked me this: Solve -268*s = -250*s + 36 for s.
++++++++++
answer:
-2