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15=f/3+13
We move all terms to the left:
15-(f/3+13)=0
We get rid of parentheses
-f/3-13+15=0
We multiply all the terms by the denominator
-f-13*3+15*3=0
We add all the numbers together, and all the variables
-1f+6=0
We move all terms containing f to the left, all other terms to the right
-f=-6
f=-6/-1
f=+6
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