question: Teacher asked me this: Solve 287*b = 415*b + 2688 for b.
++++++++++
answer: -21

question: Teacher asked me this: Solve 6526*b - 3115*b - 6510 = 3225*b for b.
++++++++++
answer: 35

question: Teacher asked me this: Solve 247*r + 347*r - 20835 = 131*r for r.
++++++++++
answer: 45

question: Teacher asked me this: Solve 373*s = -53*s + 47*s - 1516 for s.
++++++++++
answer:
-4