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5f-13=2f+8
We move all terms to the left:
5f-13-(2f+8)=0
We get rid of parentheses
5f-2f-8-13=0
We add all the numbers together, and all the variables
3f-21=0
We move all terms containing f to the left, all other terms to the right
3f=21
f=21/3
f=7
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