21=-(-x-5)

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Solution for 21=-(-x-5) equation: 



21=-(-x-5)

We move all terms to the left:

21-(-(-x-5))=0

We add all the numbers together, and all the variables

-(-(-1x-5))+21=0



We calculate terms in parentheses: -(-(-1x-5)), so:

-(-1x-5)

We get rid of parentheses

1x+5

We add all the numbers together, and all the variables

x+5

Back to the equation:

-(x+5)



We get rid of parentheses

-x-5+21=0

We add all the numbers together, and all the variables

-1x+16=0

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

-x=-16

x=-16/-1

x=+16

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