21=x+(x+13)

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



21=x+(x+13)

We move all terms to the left:

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



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

x+(x+13)

We get rid of parentheses

x+x+13

We add all the numbers together, and all the variables

2x+13

Back to the equation:

-(2x+13)



We get rid of parentheses

-2x-13+21=0

We add all the numbers together, and all the variables

-2x+8=0

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

-2x=-8

x=-8/-2

x=+4

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