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4(f+3)+4(f-1)=20
We move all terms to the left:
4(f+3)+4(f-1)-(20)=0
We multiply parentheses
4f+4f+12-4-20=0
We add all the numbers together, and all the variables
8f-12=0
We move all terms containing f to the left, all other terms to the right
8f=12
f=12/8
f=1+1/2
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