X+x=9+x

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Solution for X+x=9+x equation: 



X+X=9+X

We move all terms to the left:

X+X-(9+X)=0

We add all the numbers together, and all the variables

X+X-(X+9)=0

We add all the numbers together, and all the variables

2X-(X+9)=0

We get rid of parentheses

2X-X-9=0

We add all the numbers together, and all the variables

X-9=0

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

X=9

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