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8(F)=6F+18
We move all terms to the left:
8(F)-(6F+18)=0
We get rid of parentheses
8F-6F-18=0
We add all the numbers together, and all the variables
2F-18=0
We move all terms containing F to the left, all other terms to the right
2F=18
F=18/2
F=9
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