x+13=13+21

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Solution for x+13=13+21 equation: 



x+13=13+21

We move all terms to the left:

x+13-(13+21)=0

We add all the numbers together, and all the variables

x+13-34=0

We add all the numbers together, and all the variables

x-21=0

We move all terms containing x to the left, all other terms to the right

x=21

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