X+x+x+3=x+9

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Solution for X+x+x+3=x+9 equation: 



X+X+X+3=X+9

We move all terms to the left:

X+X+X+3-(X+9)=0

We add all the numbers together, and all the variables

3X-(X+9)+3=0

We get rid of parentheses

3X-X-9+3=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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