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18=3+3f
We move all terms to the left:
18-(3+3f)=0
We add all the numbers together, and all the variables
-(3f+3)+18=0
We get rid of parentheses
-3f-3+18=0
We add all the numbers together, and all the variables
-3f+15=0
We move all terms containing f to the left, all other terms to the right
-3f=-15
f=-15/-3
f=+5
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