-9=3(d+7)

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Solution for -9=3(d+7) equation: 



-9=3(d+7)

We move all terms to the left:

-9-(3(d+7))=0



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

3(d+7)

We multiply parentheses

3d+21

Back to the equation:

-(3d+21)



We get rid of parentheses

-3d-21-9=0

We add all the numbers together, and all the variables

-3d-30=0

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

-3d=30

d=30/-3

d=-10

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