x+x+x=639

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Solution for x+x+x=639 equation: 



x+x+x=639

We move all terms to the left:

x+x+x-(639)=0

We add all the numbers together, and all the variables

3x-639=0

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

3x=639

x=639/3

x=213

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