21=3x-3(6-2x)

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Solution for 21=3x-3(6-2x) equation: 



21=3x-3(6-2x)

We move all terms to the left:

21-(3x-3(6-2x))=0

We add all the numbers together, and all the variables

-(3x-3(-2x+6))+21=0



We calculate terms in parentheses: -(3x-3(-2x+6)), so:

3x-3(-2x+6)

We multiply parentheses

3x+6x-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+39=0

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

-9x=-39

x=-39/-9

x=4+1/3

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