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82=18+8f
We move all terms to the left:
82-(18+8f)=0
We add all the numbers together, and all the variables
-(8f+18)+82=0
We get rid of parentheses
-8f-18+82=0
We add all the numbers together, and all the variables
-8f+64=0
We move all terms containing f to the left, all other terms to the right
-8f=-64
f=-64/-8
f=+8
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