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13/20=x/20
We move all terms to the left:
13/20-(x/20)=0
We add all the numbers together, and all the variables
-(+x/20)+13/20=0
We get rid of parentheses
-x/20+13/20=0
We multiply all the terms by the denominator
-x+13=0
We add all the numbers together, and all the variables
-1x+13=0
We move all terms containing x to the left, all other terms to the right
-x=-13
x=-13/-1
x=+13
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