question: Teacher asked me this: Solve -4*u + 139 - 230 + 139 = 0 for u.
++++++++++
answer: 12

question: Teacher asked me this: Solve 20*w - 6*w + 28 = 0 for w.
++++++++++
answer: -2

question: Teacher asked me this: Solve 8682*f + 271388 + 497606 = 89771 - 58747 for f.
++++++++++
answer: -85

question: Teacher asked me this: Solve -4256*o - 90463 = -168718 - 257969 for o.
++++++++++
answer:
79