question: Teacher asked me this: Solve 18*r = -3*r - 12 + 96 for r.
++++++++++
answer: 4

question: Teacher asked me this: Solve -167 + 83 = -12*f for f.
++++++++++
answer: 7

question: Teacher asked me this: Solve 9*b = 17*b - 40 for b.
++++++++++
answer: 5

question: Teacher asked me this: Solve -10*v = 17*v - 6*v for v.
++++++++++
answer:
0