question: Teacher asked me this: Solve 3*y - 10*y - 21 = 0 for y.
++++++++++
answer: -3

question: Teacher asked me this: Solve 1282*s - 282 - 1042 = -42*s for s.
++++++++++
answer: 1

question: Teacher asked me this: Solve 560*y + 1407 + 117 = -156 for y.
++++++++++
answer: -3

question: Teacher asked me this: Solve 256*n - 2580 = -1261 + 2777 for n.
++++++++++
answer:
16