-9d=-2d-7d

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Solution for -9d=-2d-7d equation: 



-9d=-2d-7d

We move all terms to the left:

-9d-(-2d-7d)=0

We add all the numbers together, and all the variables

-9d-(-9d)=0

We get rid of parentheses

-9d+9d=0

We add all the numbers together, and all the variables

=0

d=0/1

d=0

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