question: Teacher asked me this: Solve -6 = -0*c - c for c.
++++++++++
answer: 6

question: Teacher asked me this: Solve -990*x + 779 + 976 = -945*x for x.
++++++++++
answer: 39

question: Teacher asked me this: Solve -44 - 140 = -23*a for a.
++++++++++
answer: 8

question: Teacher asked me this: Solve 354*r = 331*r + 667 for r.
++++++++++
answer:
29