-21=3(3x-3)+3(-2-x)

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Solution for -21=3(3x-3)+3(-2-x) equation: 



-21=3(3x-3)+3(-2-x)

We move all terms to the left:

-21-(3(3x-3)+3(-2-x))=0

We add all the numbers together, and all the variables

-(3(3x-3)+3(-1x-2))-21=0



We calculate terms in parentheses: -(3(3x-3)+3(-1x-2)), so:

3(3x-3)+3(-1x-2)

We multiply parentheses

9x-3x-9-6

We add all the numbers together, and all the variables

6x-15

Back to the equation:

-(6x-15)



We get rid of parentheses

-6x+15-21=0

We add all the numbers together, and all the variables

-6x-6=0

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

-6x=6

x=6/-6

x=-1

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