question: Teacher asked me this: Solve 16*o - 15*o - 4 = 0 for o.
++++++++++
answer: 4

question: Teacher asked me this: Solve 0 = t + 5 - 6 for t.
++++++++++
answer: 1

question: Teacher asked me this: Solve -7117 = 1265*y - 5075*y - 45217 for y.
++++++++++
answer: -10

question: Teacher asked me this: Solve 2*r + 57 = 37 + 40 for r.
++++++++++
answer:
10