21=-(5x+8)-2x

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Solution for 21=-(5x+8)-2x equation: 



21=-(5x+8)-2x

We move all terms to the left:

21-(-(5x+8)-2x)=0



We calculate terms in parentheses: -(-(5x+8)-2x), so:

-(5x+8)-2x

We add all the numbers together, and all the variables

-2x-(5x+8)

We get rid of parentheses

-2x-5x-8

We add all the numbers together, and all the variables

-7x-8

Back to the equation:

-(-7x-8)



We get rid of parentheses

7x+8+21=0

We add all the numbers together, and all the variables

7x+29=0

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

7x=-29

x=-29/7

x=-4+1/7

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