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8f-13=2f+17
We move all terms to the left:
8f-13-(2f+17)=0
We get rid of parentheses
8f-2f-17-13=0
We add all the numbers together, and all the variables
6f-30=0
We move all terms containing f to the left, all other terms to the right
6f=30
f=30/6
f=5
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