21=-3x+6(x+8)

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Solution for 21=-3x+6(x+8) equation: 



21=-3x+6(x+8)

We move all terms to the left:

21-(-3x+6(x+8))=0



We calculate terms in parentheses: -(-3x+6(x+8)), so:

-3x+6(x+8)

We multiply parentheses

-3x+6x+48

We add all the numbers together, and all the variables

3x+48

Back to the equation:

-(3x+48)



We get rid of parentheses

-3x-48+21=0

We add all the numbers together, and all the variables

-3x-27=0

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

-3x=27

x=27/-3

x=-9

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