-8d=-9-9d

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



-8d=-9-9d

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-8d+9d+9=0

We add all the numbers together, and all the variables

d+9=0

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

d=-9

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