question: Teacher asked me this: Solve 71 = 93*f - 53 + 31 for f.
++++++++++
answer: 1

question: Teacher asked me this: Solve 107 = -2*k + 48 + 53 for k.
++++++++++
answer: -3

question: Teacher asked me this: Solve 3*f = -3 + 9 for f.
++++++++++
answer: 2

question: Teacher asked me this: Solve 45*j - 5229 = 18*j + 40*j + 50*j for j.
++++++++++
answer:
-83