question: Teacher asked me this: Solve -10*f + 410 = 72*f for f.
++++++++++
answer: 5

question: Teacher asked me this: Solve -8776*a + 3960 = -8688*a for a.
++++++++++
answer: 45

question: Teacher asked me this: Solve -18104*b = -18131*b + 270 for b.
++++++++++
answer: 10

question: Teacher asked me this: Solve -17 = -13*n + 30*n for n.
++++++++++
answer:
-1