question: Teacher asked me this: Solve 5*r + 338 - 318 = 0 for r.
++++++++++
answer: -4

question: Teacher asked me this: Solve 9 = 8*f - 5*f for f.
++++++++++
answer: 3

question: Teacher asked me this: Solve 25*c - 49*c + 73 = -191 for c.
++++++++++
answer: 11

question: Teacher asked me this: Solve -427 = -326*o + 6156 + 2871 for o.
++++++++++
answer:
29