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8f=+5f+7
We move all terms to the left:
8f-(+5f+7)=0
We add all the numbers together, and all the variables
8f-(5f+7)=0
We get rid of parentheses
8f-5f-7=0
We add all the numbers together, and all the variables
3f-7=0
We move all terms containing f to the left, all other terms to the right
3f=7
f=7/3
f=2+1/3
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