-3=9-3d

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Solution for -3=9-3d equation: 



-3=9-3d

We move all terms to the left:

-3-(9-3d)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

3d-9-3=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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