question: Teacher asked me this: Solve -2938 + 87925 = 690*u + 507*u for u.
++++++++++
answer: 71

question: Teacher asked me this: Solve -86*r - 89*r = -190*r - 180 for r.
++++++++++
answer: -12

question: Teacher asked me this: Solve 71441*y - 71680*y = 10516 for y.
++++++++++
answer: -44

question: Teacher asked me this: Solve -162*f = 3*f - 1320 for f.
++++++++++
answer:
8