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(13x-15)=13
We move all terms to the left:
(13x-15)-(13)=0
We get rid of parentheses
13x-15-13=0
We add all the numbers together, and all the variables
13x-28=0
We move all terms containing x to the left, all other terms to the right
13x=28
x=28/13
x=2+2/13
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