21=-6x-3(-4x+9)

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Solution for 21=-6x-3(-4x+9) equation: 



21=-6x-3(-4x+9)

We move all terms to the left:

21-(-6x-3(-4x+9))=0



We calculate terms in parentheses: -(-6x-3(-4x+9)), so:

-6x-3(-4x+9)

We multiply parentheses

-6x+12x-27

We add all the numbers together, and all the variables

6x-27

Back to the equation:

-(6x-27)



We get rid of parentheses

-6x+27+21=0

We add all the numbers together, and all the variables

-6x+48=0

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

-6x=-48

x=-48/-6

x=+8

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