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18=2+4f
We move all terms to the left:
18-(2+4f)=0
We add all the numbers together, and all the variables
-(4f+2)+18=0
We get rid of parentheses
-4f-2+18=0
We add all the numbers together, and all the variables
-4f+16=0
We move all terms containing f to the left, all other terms to the right
-4f=-16
f=-16/-4
f=+4
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