(X+21)=(3x+9)

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Solution for (X+21)=(3x+9) equation: 



(X+21)=(3X+9)

We move all terms to the left:

(X+21)-((3X+9))=0

We get rid of parentheses

X-((3X+9))+21=0



We calculate terms in parentheses: -((3X+9)), so:

(3X+9)

We get rid of parentheses

3X+9

Back to the equation:

-(3X+9)



We get rid of parentheses

X-3X-9+21=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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