4D^2=-9y

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Solution for 4D^2=-9y equation: 



4^2=-9D

We move all terms to the left:

4^2-(-9D)=0

We add all the numbers together, and all the variables

-(-9D)+16=0

We get rid of parentheses

9D+16=0

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

9D=-16

D=-16/9

D=-1+7/9

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