question: Teacher asked me this: Solve -81*f = 87*f - 67 - 1109 for f.
++++++++++
answer: 7

question: Teacher asked me this: Solve -370 = 588*w + 9626 for w.
++++++++++
answer: -17

question: Teacher asked me this: Solve 31 + 94 = 20*b - 135 for b.
++++++++++
answer: 13

question: Teacher asked me this: Solve 686*w = 466*w + 2664 - 12344 for w.
++++++++++
answer:
-44