(X+84)=3x

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Solution for (X+84)=3x equation: 



(X+84)=3X

We move all terms to the left:

(X+84)-(3X)=0

We add all the numbers together, and all the variables

-3X+(X+84)=0

We get rid of parentheses

-3X+X+84=0

We add all the numbers together, and all the variables

-2X+84=0

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

-2X=-84

X=-84/-2

X=+42

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