-3(d+12)-21=15

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Solution for -3(d+12)-21=15 equation: 



-3(d+12)-21=15

We move all terms to the left:

-3(d+12)-21-(15)=0

We add all the numbers together, and all the variables

-3(d+12)-36=0

We multiply parentheses

-3d-36-36=0

We add all the numbers together, and all the variables

-3d-72=0

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

-3d=72

d=72/-3

d=-24

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