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13x-7=15x-13
We move all terms to the left:
13x-7-(15x-13)=0
We get rid of parentheses
13x-15x+13-7=0
We add all the numbers together, and all the variables
-2x+6=0
We move all terms containing x to the left, all other terms to the right
-2x=-6
x=-6/-2
x=+3
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