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5f=3f+8
We move all terms to the left:
5f-(3f+8)=0
We get rid of parentheses
5f-3f-8=0
We add all the numbers together, and all the variables
2f-8=0
We move all terms containing f to the left, all other terms to the right
2f=8
f=8/2
f=4
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