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4f+4(2f-5)=28
We move all terms to the left:
4f+4(2f-5)-(28)=0
We multiply parentheses
4f+8f-20-28=0
We add all the numbers together, and all the variables
12f-48=0
We move all terms containing f to the left, all other terms to the right
12f=48
f=48/12
f=4
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