question: Teacher asked me this: Solve -839*d + 77 + 663 = -99 for d.
++++++++++
answer: 1

question: Teacher asked me this: Solve 0 = -3*y - 9 - 3 for y.
++++++++++
answer: -4

question: Teacher asked me this: Solve 2*b = -66 + 74 for b.
++++++++++
answer: 4

question: Teacher asked me this: Solve 0 = -8*o - 90 + 82 for o.
++++++++++
answer:
-1