21=3d-6

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Solution for 21=3d-6 equation: 



21=3d-6

We move all terms to the left:

21-(3d-6)=0

We get rid of parentheses

-3d+6+21=0

We add all the numbers together, and all the variables

-3d+27=0

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

-3d=-27

d=-27/-3

d=+9

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