question: Teacher asked me this: Solve 140 = 23*z + 12*z for z.
++++++++++
answer: 4

question: Teacher asked me this: Solve -29*l + 41 = 24*l - 12 for l.
++++++++++
answer: 1

question: Teacher asked me this: Solve -82 + 19 = 31*f - 52*f for f.
++++++++++
answer: 3

question: Teacher asked me this: Solve 3 = z + 5 for z.
++++++++++
answer:
-2