question: Teacher asked me this: Solve 66*i - 117 = -249 for i.
++++++++++
answer: -2

question: Teacher asked me this: Solve 853*k + 41*k = 42018 for k.
++++++++++
answer: 47

question: Teacher asked me this: Solve 5*r + 32 = 7 for r.
++++++++++
answer: -5

question: Teacher asked me this: Solve 0 = 55*r + 7810 - 11330 for r.
++++++++++
answer:
64