-9d-7+2d=-28

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Solution for -9d-7+2d=-28 equation: 



-9d-7+2d=-28

We move all terms to the left:

-9d-7+2d-(-28)=0

We add all the numbers together, and all the variables

-7d+21=0

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

-7d=-21

d=-21/-7

d=+3

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