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f/5+3=4
We move all terms to the left:
f/5+3-(4)=0
We add all the numbers together, and all the variables
f/5-1=0
We multiply all the terms by the denominator
f-1*5=0
We add all the numbers together, and all the variables
f-5=0
We move all terms containing f to the left, all other terms to the right
f=5
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