question: Teacher asked me this: Solve 10*z + z - 5*z = 90 for z.
++++++++++
answer: 15

question: Teacher asked me this: Solve 17*w + 30 = 64 + 51 for w.
++++++++++
answer: 5

question: Teacher asked me this: Solve 92*s = 90*s - 4 for s.
++++++++++
answer: -2

question: Teacher asked me this: Solve 95 = 32*h - 13*h for h.
++++++++++
answer:
5