21=6x+3(x+6)

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Solution for 21=6x+3(x+6) equation: 



21=6x+3(x+6)

We move all terms to the left:

21-(6x+3(x+6))=0



We calculate terms in parentheses: -(6x+3(x+6)), so:

6x+3(x+6)

We multiply parentheses

6x+3x+18

We add all the numbers together, and all the variables

9x+18

Back to the equation:

-(9x+18)



We get rid of parentheses

-9x-18+21=0

We add all the numbers together, and all the variables

-9x+3=0

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

-9x=-3

x=-3/-9

x=1/3

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