12=9-3d

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Solution for 12=9-3d equation: 



12=9-3d

We move all terms to the left:

12-(9-3d)=0

We add all the numbers together, and all the variables

-(-3d+9)+12=0

We get rid of parentheses

3d-9+12=0

We add all the numbers together, and all the variables

3d+3=0

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

3d=-3

d=-3/3

d=-1

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