(X-12)=3x

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Solution for (X-12)=3x equation: 



(X-12)=3X

We move all terms to the left:

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

We add all the numbers together, and all the variables

-3X+(X-12)=0

We get rid of parentheses

-3X+X-12=0

We add all the numbers together, and all the variables

-2X-12=0

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

-2X=12

X=12/-2

X=-6

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