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13=f/3
We move all terms to the left:
13-(f/3)=0
We add all the numbers together, and all the variables
-(+f/3)+13=0
We get rid of parentheses
-f/3+13=0
We multiply all the terms by the denominator
-f+13*3=0
We add all the numbers together, and all the variables
-1f+39=0
We move all terms containing f to the left, all other terms to the right
-f=-39
f=-39/-1
f=+39
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