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4(5f-10)=20
We move all terms to the left:
4(5f-10)-(20)=0
We multiply parentheses
20f-40-20=0
We add all the numbers together, and all the variables
20f-60=0
We move all terms containing f to the left, all other terms to the right
20f=60
f=60/20
f=3
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