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12=f+7f=
We move all terms to the left:
12-(f+7f)=0
We add all the numbers together, and all the variables
-(+8f)+12=0
We get rid of parentheses
-8f+12=0
We move all terms containing f to the left, all other terms to the right
-8f=-12
f=-12/-8
f=1+1/2
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