3d-9=3+6d

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Solution for 3d-9=3+6d equation: 



3d-9=3+6d

We move all terms to the left:

3d-9-(3+6d)=0

We add all the numbers together, and all the variables

3d-(6d+3)-9=0

We get rid of parentheses

3d-6d-3-9=0

We add all the numbers together, and all the variables

-3d-12=0

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

-3d=12

d=12/-3

d=-4

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