8d-7=9d

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Solution for 8d-7=9d equation: 



8d-7=9d

We move all terms to the left:

8d-7-(9d)=0

We add all the numbers together, and all the variables

-1d-7=0

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

-d=7

d=7/-1

d=-7

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