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f/7-21=(-29)
We move all terms to the left:
f/7-21-((-29))=0
We add all the numbers together, and all the variables
f/7+8=0
We multiply all the terms by the denominator
f+8*7=0
We add all the numbers together, and all the variables
f+56=0
We move all terms containing f to the left, all other terms to the right
f=-56
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