d+9=-2d

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Solution for d+9=-2d equation: 



d+9=-2d

We move all terms to the left:

d+9-(-2d)=0

We get rid of parentheses

d+2d+9=0

We add all the numbers together, and all the variables

3d+9=0

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

3d=-9

d=-9/3

d=-3

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