X+x+x=12-3

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Solution for X+x+x=12-3 equation: 



X+X+X=12-3

We move all terms to the left:

X+X+X-(12-3)=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

3X-9=0

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

3X=9

X=9/3

X=3

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