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(20x-28)=13
We move all terms to the left:
(20x-28)-(13)=0
We get rid of parentheses
20x-28-13=0
We add all the numbers together, and all the variables
20x-41=0
We move all terms containing x to the left, all other terms to the right
20x=41
x=41/20
x=2+1/20
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