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8f-5=3f+15
We move all terms to the left:
8f-5-(3f+15)=0
We get rid of parentheses
8f-3f-15-5=0
We add all the numbers together, and all the variables
5f-20=0
We move all terms containing f to the left, all other terms to the right
5f=20
f=20/5
f=4
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