X+3x+x+3x=72

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Solution for X+3x+x+3x=72 equation: 



X+3X+X+3X=72

We move all terms to the left:

X+3X+X+3X-(72)=0

We add all the numbers together, and all the variables

8X-72=0

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

8X=72

X=72/8

X=9

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