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4(5+3f)=23
We move all terms to the left:
4(5+3f)-(23)=0
We add all the numbers together, and all the variables
4(3f+5)-23=0
We multiply parentheses
12f+20-23=0
We add all the numbers together, and all the variables
12f-3=0
We move all terms containing f to the left, all other terms to the right
12f=3
f=3/12
f=1/4
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