X+x+18=72

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Solution for X+x+18=72 equation: 



X+X+18=72

We move all terms to the left:

X+X+18-(72)=0

We add all the numbers together, and all the variables

2X-54=0

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

2X=54

X=54/2

X=27

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