3=3d+9

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Solution for 3=3d+9 equation: 



3=3d+9

We move all terms to the left:

3-(3d+9)=0

We get rid of parentheses

-3d-9+3=0

We add all the numbers together, and all the variables

-3d-6=0

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

-3d=6

d=6/-3

d=-2

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