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10f-13=2f+7
We move all terms to the left:
10f-13-(2f+7)=0
We get rid of parentheses
10f-2f-7-13=0
We add all the numbers together, and all the variables
8f-20=0
We move all terms containing f to the left, all other terms to the right
8f=20
f=20/8
f=2+1/2
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