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-8=f/13
We move all terms to the left:
-8-(f/13)=0
We add all the numbers together, and all the variables
-(+f/13)-8=0
We get rid of parentheses
-f/13-8=0
We multiply all the terms by the denominator
-f-8*13=0
We add all the numbers together, and all the variables
-1f-104=0
We move all terms containing f to the left, all other terms to the right
-f=104
f=104/-1
f=-104
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