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f-18=6+3f
We move all terms to the left:
f-18-(6+3f)=0
We add all the numbers together, and all the variables
f-(3f+6)-18=0
We get rid of parentheses
f-3f-6-18=0
We add all the numbers together, and all the variables
-2f-24=0
We move all terms containing f to the left, all other terms to the right
-2f=24
f=24/-2
f=-12
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