9=21-2d

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Solution for 9=21-2d equation: 



9=21-2d

We move all terms to the left:

9-(21-2d)=0

We add all the numbers together, and all the variables

-(-2d+21)+9=0

We get rid of parentheses

2d-21+9=0

We add all the numbers together, and all the variables

2d-12=0

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

2d=12

d=12/2

d=6

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