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

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



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

We move all terms to the left:

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



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

3(x+8)+6x

We add all the numbers together, and all the variables

6x+3(x+8)

We multiply parentheses

6x+3x+24

We add all the numbers together, and all the variables

9x+24

Back to the equation:

-(9x+24)



We get rid of parentheses

-9x-24-21=0

We add all the numbers together, and all the variables

-9x-45=0

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

-9x=45

x=45/-9

x=-5

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