9d=-8-7d

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Solution for 9d=-8-7d equation: 



9d=-8-7d

We move all terms to the left:

9d-(-8-7d)=0

We add all the numbers together, and all the variables

9d-(-7d-8)=0

We get rid of parentheses

9d+7d+8=0

We add all the numbers together, and all the variables

16d+8=0

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

16d=-8

d=-8/16

d=-1/2

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