21=-3(8d+4)

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Solution for 21=-3(8d+4) equation: 



21=-3(8d+4)

We move all terms to the left:

21-(-3(8d+4))=0



We calculate terms in parentheses: -(-3(8d+4)), so:

-3(8d+4)

We multiply parentheses

-24d-12

Back to the equation:

-(-24d-12)



We get rid of parentheses

24d+12+21=0

We add all the numbers together, and all the variables

24d+33=0

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

24d=-33

d=-33/24

d=-1+3/8

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