21=-(3+8d)

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Solution for 21=-(3+8d) equation: 



21=-(3+8d)

We move all terms to the left:

21-(-(3+8d))=0

We add all the numbers together, and all the variables

-(-(8d+3))+21=0



We calculate terms in parentheses: -(-(8d+3)), so:

-(8d+3)

We get rid of parentheses

-8d-3

Back to the equation:

-(-8d-3)



We get rid of parentheses

8d+3+21=0

We add all the numbers together, and all the variables

8d+24=0

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

8d=-24

d=-24/8

d=-3

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