question: Teacher asked me this: Solve 89*r - 1560 - 220 = 0 for r.
++++++++++
answer: 20

question: Teacher asked me this: Solve -24*n + 6702 = 251*n + 1202 for n.
++++++++++
answer: 20

question: Teacher asked me this: Solve -99*u + 118*u - 76 = 0 for u.
++++++++++
answer: 4

question: Teacher asked me this: Solve -175*n + 119 = 4*n + 3162 for n.
++++++++++
answer:
-17