question: Teacher asked me this: Solve 209*x = -134*x + 125*x + 872 for x.
++++++++++
answer: 4

question: Teacher asked me this: Solve 88*r + 77 = 77*r for r.
++++++++++
answer: -7

question: Teacher asked me this: Solve 112*z + 1240 = -1012 + 684 for z.
++++++++++
answer: -14

question: Teacher asked me this: Solve -23*z + 7*z = -80 for z.
++++++++++
answer:
5