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x+13+13=x+x
We move all terms to the left:
x+13+13-(x+x)=0
We add all the numbers together, and all the variables
x-(+2x)+13+13=0
We add all the numbers together, and all the variables
x-(+2x)+26=0
We get rid of parentheses
x-2x+26=0
We add all the numbers together, and all the variables
-1x+26=0
We move all terms containing x to the left, all other terms to the right
-x=-26
x=-26/-1
x=+26
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