question: Teacher asked me this: Solve 0*r + 40 = 20*r for r.
++++++++++
answer: 2

question: Teacher asked me this: Solve 0 = g + 95 - 85 for g.
++++++++++
answer: -10

question: Teacher asked me this: Solve -692*x = -672*x - 180 for x.
++++++++++
answer: 9

question: Teacher asked me this: Solve 0 = 3083*c - 2948*c for c.
++++++++++
answer:
0