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3(f-13)=16
We move all terms to the left:
3(f-13)-(16)=0
We multiply parentheses
3f-39-16=0
We add all the numbers together, and all the variables
3f-55=0
We move all terms containing f to the left, all other terms to the right
3f=55
f=55/3
f=18+1/3
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