X+x+x=10+2

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Solution for X+x+x=10+2 equation: 



X+X+X=10+2

We move all terms to the left:

X+X+X-(10+2)=0

We add all the numbers together, and all the variables

X+X+X-12=0

We add all the numbers together, and all the variables

3X-12=0

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

3X=12

X=12/3

X=4

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