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