(D3-3D2+9D+13y)=0

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Solution for (D3-3D2+9D+13y)=0 equation: 



(3-32+9+13D)=0

We add all the numbers together, and all the variables

(13D-20)=0

We get rid of parentheses

13D-20=0

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

13D=20

D=20/13

D=1+7/13

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