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x-13=7x+23
We move all terms to the left:
x-13-(7x+23)=0
We get rid of parentheses
x-7x-23-13=0
We add all the numbers together, and all the variables
-6x-36=0
We move all terms containing x to the left, all other terms to the right
-6x=36
x=36/-6
x=-6
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