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5(2f-4)=10
We move all terms to the left:
5(2f-4)-(10)=0
We multiply parentheses
10f-20-10=0
We add all the numbers together, and all the variables
10f-30=0
We move all terms containing f to the left, all other terms to the right
10f=30
f=30/10
f=3
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