question: Teacher asked me this: Solve -8*s + 9*s - 7 = 0 for s.
++++++++++
answer: 7

question: Teacher asked me this: Solve 239*b = 228*b + 22 for b.
++++++++++
answer: 2

question: Teacher asked me this: Solve -220*i + 140 = -28*i - 436 for i.
++++++++++
answer: 3

question: Teacher asked me this: Solve 58 = 19*j - 94 for j.
++++++++++
answer:
8