question: Teacher asked me this: Solve 85181 - 85111 = 7*i for i.
++++++++++
answer: 10

question: Teacher asked me this: Solve -9065*r + 264 = -9089*r for r.
++++++++++
answer: -11

question: Teacher asked me this: Solve -11*u + 82 - 104 = 0 for u.
++++++++++
answer: -2

question: Teacher asked me this: Solve 129*m = 139*m + 20 for m.
++++++++++
answer:
-2