question: Teacher asked me this: Solve -f - 12*f = 65 for f.
++++++++++
answer: -5

question: Teacher asked me this: Solve 105*y - 614295 = -615135 for y.
++++++++++
answer: -8

question: Teacher asked me this: Solve 99*w - 100 = -718 - 174 for w.
++++++++++
answer: -8

question: Teacher asked me this: Solve 21*d + 217 = 280 for d.
++++++++++
answer:
3