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x+13+x+13=x+43
We move all terms to the left:
x+13+x+13-(x+43)=0
We add all the numbers together, and all the variables
2x-(x+43)+26=0
We get rid of parentheses
2x-x-43+26=0
We add all the numbers together, and all the variables
x-17=0
We move all terms containing x to the left, all other terms to the right
x=17
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