-11d-21=-3(d+7)-8d

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Solution for -11d-21=-3(d+7)-8d equation: 



-11d-21=-3(d+7)-8d

We move all terms to the left:

-11d-21-(-3(d+7)-8d)=0



We calculate terms in parentheses: -(-3(d+7)-8d), so:

-3(d+7)-8d

We add all the numbers together, and all the variables

-8d-3(d+7)

We multiply parentheses

-8d-3d-21

We add all the numbers together, and all the variables

-11d-21

Back to the equation:

-(-11d-21)



We get rid of parentheses

-11d+11d+21-21=0

We add all the numbers together, and all the variables

=0

d=0/1

d=0

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