question: Teacher asked me this: Solve -439515 = 30*r - 436215 for r.
++++++++++
answer: -110

question: Teacher asked me this: Solve -8*o - 4*o - 72 = 0 for o.
++++++++++
answer: -6

question: Teacher asked me this: Solve -6580*r = -7120*r + 9720 for r.
++++++++++
answer: 18

question: Teacher asked me this: Solve 55*k + 36 = -41*k - 60 for k.
++++++++++
answer:
-1