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f/3+16=20
We move all terms to the left:
f/3+16-(20)=0
We add all the numbers together, and all the variables
f/3-4=0
We multiply all the terms by the denominator
f-4*3=0
We add all the numbers together, and all the variables
f-12=0
We move all terms containing f to the left, all other terms to the right
f=12
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