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

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



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

We move all terms to the left:

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

We get rid of parentheses

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



We calculate terms in parentheses: -((x+21)), so:

(x+21)

We get rid of parentheses

x+21

Back to the equation:

-(x+21)



We get rid of parentheses

3x-x-21-9=0

We add all the numbers together, and all the variables

2x-30=0

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

2x=30

x=30/2

x=15

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