X+2x=15.

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Solution for X+2x=15. equation: 



X+2X=15.

We move all terms to the left:

X+2X-(15.)=0

We add all the numbers together, and all the variables

X+2X-15=0

We add all the numbers together, and all the variables

3X-15=0

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

3X=15

X=15/3

X=5

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