-d-9=8d

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Solution for -d-9=8d equation: 



-d-9=8d

We move all terms to the left:

-d-9-(8d)=0

We add all the numbers together, and all the variables

-9d-9=0

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

-9d=9

d=9/-9

d=-1

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