question: Teacher asked me this: Solve 0 = -219*o + 169*o + 650 for o.
++++++++++
answer: 13

question: Teacher asked me this: Solve 66901 = 173*f - 1161*f + 13068 - 38051 for f.
++++++++++
answer: -93

question: Teacher asked me this: Solve -30*t - 4 = -31*t for t.
++++++++++
answer: 4

question: Teacher asked me this: Solve -242*u + 2040 - 1675 = -3265 for u.
++++++++++
answer:
15