question: Teacher asked me this: Solve 0*c = -7*c - 28 for c.
++++++++++
answer: -4

question: Teacher asked me this: Solve 0 = -135*k + 45589 - 42484 for k.
++++++++++
answer: 23

question: Teacher asked me this: Solve -7935 + 6370 - 13547 = -1767*y + 41432 for y.
++++++++++
answer: 32

question: Teacher asked me this: Solve 193 = -122*r + 3270 + 1071 for r.
++++++++++
answer:
34