how can i make this into an equation

thank you so much for helping,i just need to be able to put it into an equation now.im terrible at word problems.
related to an answer for: Separate the number 27 into two parts so that the first number is twice the second number. What are the numbers?
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OK, let one part have a value of x then the other part has a value of 2x. Together they add up to 27 so the equation is 2x+x=27, that is, 3x=27, so dividing by 3 on each side, x=27/3=9. And 2x=18.

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