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-2+2f+6f=3f+13
We move all terms to the left:
-2+2f+6f-(3f+13)=0
We add all the numbers together, and all the variables
8f-(3f+13)-2=0
We get rid of parentheses
8f-3f-13-2=0
We add all the numbers together, and all the variables
5f-15=0
We move all terms containing f to the left, all other terms to the right
5f=15
f=15/5
f=3
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