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13=2f+513=2f+5
We move all terms to the left:
13-(2f+513)=0
We get rid of parentheses
-2f-513+13=0
We add all the numbers together, and all the variables
-2f-500=0
We move all terms containing f to the left, all other terms to the right
-2f=500
f=500/-2
f=-250
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