X+9+x=15

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Solution for X+9+x=15 equation: 



X+9+X=15

We move all terms to the left:

X+9+X-(15)=0

We add all the numbers together, and all the variables

2X-6=0

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

2X=6

X=6/2

X=3

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