question: Teacher asked me this: Solve 2*c - 4*c = 4 for c.
++++++++++
answer: -2

question: Teacher asked me this: Solve 17*w - 29 - 22 = 0 for w.
++++++++++
answer: 3

question: Teacher asked me this: Solve -45*k - 516 = -3*k + k for k.
++++++++++
answer: -12

question: Teacher asked me this: Solve -56*m + 509 = 5 for m.
++++++++++
answer:
9