question: Teacher asked me this: Solve -413014*d + 413041*d - 291 + 221 = 497 for d.
++++++++++
answer: 21

question: Teacher asked me this: Solve -6*o + 16388 = 15950 for o.
++++++++++
answer: 73

question: Teacher asked me this: Solve -239 = -4*a - 231 for a.
++++++++++
answer: 2

question: Teacher asked me this: Solve -24*w + 126 = 30 for w.
++++++++++
answer:
4