question: Teacher asked me this: Solve 0 = 427*f - 478*f - 357 for f.
++++++++++
answer: -7

question: Teacher asked me this: Solve 82*q = 16*q + 198 for q.
++++++++++
answer: 3

question: Teacher asked me this: Solve 6*o + 28*o - 306 = 0 for o.
++++++++++
answer: 9

question: Teacher asked me this: Solve 0 = o + 4*o - 9*o for o.
++++++++++
answer:
0