question: Teacher asked me this: Solve 673 - 85 = 49*n for n.
++++++++++
answer: 12

question: Teacher asked me this: Solve -k + 45*k + 672 = -68*k for k.
++++++++++
answer: -6

question: Teacher asked me this: Solve 346*b = 402*b - 560 for b.
++++++++++
answer: 10

question: Teacher asked me this: Solve -535 = -77*f + 242 + 532 for f.
++++++++++
answer:
17