question: Teacher asked me this: Solve -5*s - 639 = -654 for s.
++++++++++
answer: 3

question: Teacher asked me this: Solve -39*c - 2484 = 87*c + 3*c + 78*c for c.
++++++++++
answer: -12

question: Teacher asked me this: Solve 3*v + 0 = 12 for v.
++++++++++
answer: 4

question: Teacher asked me this: Solve -10*c + 34 + 46 = 0 for c.
++++++++++
answer:
8