-9=8d+d

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Solution for -9=8d+d equation: 



-9=8d+d

We move all terms to the left:

-9-(8d+d)=0

We add all the numbers together, and all the variables

-(+9d)-9=0

We get rid of parentheses

-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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