-2d-d=9

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Solution for -2d-d=9 equation: 



-2d-d=9

We move all terms to the left:

-2d-d-(9)=0

We add all the numbers together, and all the variables

-3d-9=0

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

-3d=9

d=9/-3

d=-3

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