question: Teacher asked me this: Solve 2*r = -4 - 2 for r.
++++++++++
answer: -3

question: Teacher asked me this: Solve -15*s - 13 - 62 = 0 for s.
++++++++++
answer: -5

question: Teacher asked me this: Solve 52923 = 1409*f - 64024 for f.
++++++++++
answer: 83

question: Teacher asked me this: Solve 88*u - 21*u - 18564 = 199*u + 141*u for u.
++++++++++
answer:
-68