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f/7-28=-25
We move all terms to the left:
f/7-28-(-25)=0
We add all the numbers together, and all the variables
f/7-3=0
We multiply all the terms by the denominator
f-3*7=0
We add all the numbers together, and all the variables
f-21=0
We move all terms containing f to the left, all other terms to the right
f=21
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