9d-9=12+16d

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Solution for 9d-9=12+16d equation: 



9d-9=12+16d

We move all terms to the left:

9d-9-(12+16d)=0

We add all the numbers together, and all the variables

9d-(16d+12)-9=0

We get rid of parentheses

9d-16d-12-9=0

We add all the numbers together, and all the variables

-7d-21=0

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

-7d=21

d=21/-7

d=-3

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