-3(9+5d)=-21

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Solution for -3(9+5d)=-21 equation: 



-3(9+5d)=-21

We move all terms to the left:

-3(9+5d)-(-21)=0

We add all the numbers together, and all the variables

-3(5d+9)-(-21)=0

We add all the numbers together, and all the variables

-3(5d+9)+21=0

We multiply parentheses

-15d-27+21=0

We add all the numbers together, and all the variables

-15d-6=0

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

-15d=6

d=6/-15

d=-2/5

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