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18=6f/2
We move all terms to the left:
18-(6f/2)=0
We add all the numbers together, and all the variables
-(+6f/2)+18=0
We get rid of parentheses
-6f/2+18=0
We multiply all the terms by the denominator
-6f+18*2=0
We add all the numbers together, and all the variables
-6f+36=0
We move all terms containing f to the left, all other terms to the right
-6f=-36
f=-36/-6
f=+6
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