question: Teacher asked me this: Solve -30 = -60*f + 70*f for f.
++++++++++
answer: -3

question: Teacher asked me this: Solve -4105*f = -4584 + 158414 + 88365 for f.
++++++++++
answer: -59

question: Teacher asked me this: Solve -31792*a + 31873*a + 1458 = 0 for a.
++++++++++
answer: -18

question: Teacher asked me this: Solve 1248*o - 111 = 1285*o for o.
++++++++++
answer:
-3