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7f-10=f+3f+8
We move all terms to the left:
7f-10-(f+3f+8)=0
We add all the numbers together, and all the variables
7f-(4f+8)-10=0
We get rid of parentheses
7f-4f-8-10=0
We add all the numbers together, and all the variables
3f-18=0
We move all terms containing f to the left, all other terms to the right
3f=18
f=18/3
f=6
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