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X=7X+13
We move all terms to the left:
X-(7X+13)=0
We get rid of parentheses
X-7X-13=0
We add all the numbers together, and all the variables
-6X-13=0
We move all terms containing X to the left, all other terms to the right
-6X=13
X=13/-6
X=-2+1/6
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