X+(2x)+x=12

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Solution for X+(2x)+x=12 equation: 



X+(2X)+X=12

We move all terms to the left:

X+(2X)+X-(12)=0

We add all the numbers together, and all the variables

4X-12=0

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

4X=12

X=12/4

X=3

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