D+7=-3d-9

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Solution for D+7=-3d-9 equation: 



+7=-3D-9

We move all terms to the left:

+7-(-3D-9)=0

We get rid of parentheses

3D+9+7=0

We add all the numbers together, and all the variables

3D+16=0

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

3D=-16

D=-16/3

D=-5+1/3

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