question: Teacher asked me this: Solve -2 = -2*z - 8 for z.
++++++++++
answer: -3

question: Teacher asked me this: Solve -30*h + 8*h - 166 = -298 for h.
++++++++++
answer: 6

question: Teacher asked me this: Solve 0 = -320*r + 156*r + 160*r - 108 for r.
++++++++++
answer: -27

question: Teacher asked me this: Solve 43 = 2*v + 37 for v.
++++++++++
answer:
3