D=n+9

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Solution for D=n+9 equation: 



=D+9

We move all terms to the left:

-(D+9)=0

We get rid of parentheses

-D-9=0

We add all the numbers together, and all the variables

-1D-9=0

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

-D=9

D=9/-1

D=-9

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