X+12+x+8=3x

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Solution for X+12+x+8=3x equation: 



X+12+X+8=3X

We move all terms to the left:

X+12+X+8-(3X)=0

We add all the numbers together, and all the variables

-1X+20=0

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

-X=-20

X=-20/-1

X=+20

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