21=-(3+6x)

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



21=-(3+6x)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



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

-(6x+3)

We get rid of parentheses

-6x-3

Back to the equation:

-(-6x-3)



We get rid of parentheses

6x+3+21=0

We add all the numbers together, and all the variables

6x+24=0

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

6x=-24

x=-24/6

x=-4

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