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-10=f/2-13
We move all terms to the left:
-10-(f/2-13)=0
We get rid of parentheses
-f/2+13-10=0
We multiply all the terms by the denominator
-f+13*2-10*2=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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