21=d-6

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Solution for 21=d-6 equation: 



21=d-6

We move all terms to the left:

21-(d-6)=0

We get rid of parentheses

-d+6+21=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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