question: Teacher asked me this: Solve -71 = -2*r - 69 for r.
++++++++++
answer: 1

question: Teacher asked me this: Solve -23122 = -1904*d + 1630 for d.
++++++++++
answer: 13

question: Teacher asked me this: Solve -284*s - 250*s - 3176 = -137*s for s.
++++++++++
answer: -8

question: Teacher asked me this: Solve -1508 = 19*c - 108*c - 1001*c + 1762 for c.
++++++++++
answer:
3