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3(f-3)+5=23
We move all terms to the left:
3(f-3)+5-(23)=0
We add all the numbers together, and all the variables
3(f-3)-18=0
We multiply parentheses
3f-9-18=0
We add all the numbers together, and all the variables
3f-27=0
We move all terms containing f to the left, all other terms to the right
3f=27
f=27/3
f=9
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