21=x-(-13)

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Solution for 21=x-(-13) equation: 



21=x-(-13)

We move all terms to the left:

21-(x-(-13))=0



We calculate terms in parentheses: -(x-(-13)), so:

x-(-13)

We add all the numbers together, and all the variables

x+13

Back to the equation:

-(x+13)



We get rid of parentheses

-x-13+21=0

We add all the numbers together, and all the variables

-1x+8=0

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

-x=-8

x=-8/-1

x=+8

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