question: Teacher asked me this: Solve -2835 = -198*z + 49*z + 68*z for z.
++++++++++
answer: 35

question: Teacher asked me this: Solve -36410*o = -36507*o - 3880 for o.
++++++++++
answer: -40

question: Teacher asked me this: Solve -219*r + 664*r = 111*r + 106*r - 3192 for r.
++++++++++
answer: -14

question: Teacher asked me this: Solve 0 = 18*s - 30*s + 84 for s.
++++++++++
answer:
7