-8d=-9-7d

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



-8d=-9-7d

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-8d+7d+9=0

We add all the numbers together, and all the variables

-1d+9=0

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

-d=-9

d=-9/-1

d=+9

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