-6d-3d+2d=21

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Solution for -6d-3d+2d=21 equation: 



-6d-3d+2d=21

We move all terms to the left:

-6d-3d+2d-(21)=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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