3+3d=-9-d

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



3+3d=-9-d

We move all terms to the left:

3+3d-(-9-d)=0

We add all the numbers together, and all the variables

3d-(-1d-9)+3=0

We get rid of parentheses

3d+1d+9+3=0

We add all the numbers together, and all the variables

4d+12=0

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

4d=-12

d=-12/4

d=-3

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