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17=f/2+13
We move all terms to the left:
17-(f/2+13)=0
We get rid of parentheses
-f/2-13+17=0
We multiply all the terms by the denominator
-f-13*2+17*2=0
We add all the numbers together, and all the variables
-1f+8=0
We move all terms containing f to the left, all other terms to the right
-f=-8
f=-8/-1
f=+8
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