question: Teacher asked me this: Solve 0 = 469*c - 571*c + 1938 for c.
++++++++++
answer: 19

question: Teacher asked me this: Solve -4*n - 11 - 1 = 0 for n.
++++++++++
answer: -3

question: Teacher asked me this: Solve 117*a - 552*a = -206*a for a.
++++++++++
answer: 0

question: Teacher asked me this: Solve 0 = 3*a + 8*a - 2*a for a.
++++++++++
answer:
0