-6=d+21

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Solution for -6=d+21 equation: 



-6=d+21

We move all terms to the left:

-6-(d+21)=0

We get rid of parentheses

-d-21-6=0

We add all the numbers together, and all the variables

-1d-27=0

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

-d=27

d=27/-1

d=-27

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