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7=f/13
We move all terms to the left:
7-(f/13)=0
We add all the numbers together, and all the variables
-(+f/13)+7=0
We get rid of parentheses
-f/13+7=0
We multiply all the terms by the denominator
-f+7*13=0
We add all the numbers together, and all the variables
-1f+91=0
We move all terms containing f to the left, all other terms to the right
-f=-91
f=-91/-1
f=+91
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