question: Teacher asked me this: Solve 3*r - 8 = 1 for r.
++++++++++
answer: 3

question: Teacher asked me this: Solve 134*o = 135*o + 1 - 10 for o.
++++++++++
answer: 9

question: Teacher asked me this: Solve -57 = -3*c - 72 for c.
++++++++++
answer: -5

question: Teacher asked me this: Solve 0 = -43*u + 23 - 168 - 156 for u.
++++++++++
answer:
-7