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x+x=13=x+x=13=x-x=6=x+x=8
We move all terms to the left:
x+x-(13)=0
We add all the numbers together, and all the variables
2x-13=0
We move all terms containing x to the left, all other terms to the right
2x=13
x=13/2
x=6+1/2
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