X+x+x=120

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Solution for X+x+x=120 equation: 



X+X+X=120

We move all terms to the left:

X+X+X-(120)=0

We add all the numbers together, and all the variables

3X-120=0

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

3X=120

X=120/3

X=40

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