question: Teacher asked me this: Solve 53*z + 348 - 972 = 5*z for z.
++++++++++
answer: 13

question: Teacher asked me this: Solve -64 = 3*r - 61 for r.
++++++++++
answer: -1

question: Teacher asked me this: Solve -390*g = -1228*g + 60336 for g.
++++++++++
answer: 72

question: Teacher asked me this: Solve 0 = 3*b - 7*b for b.
++++++++++
answer:
0