X+x+x=7

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Solution for X+x+x=7 equation: 



X+X+X=7

We move all terms to the left:

X+X+X-(7)=0

We add all the numbers together, and all the variables

3X-7=0

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

3X=7

X=7/3

X=2+1/3

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