9d-3D+2d-7d-2d=18

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Solution for 9d-3D+2d-7d-2d=18 equation: 



9d-3+2d-7d-2d=18

We move all terms to the left:

9d-3+2d-7d-2d-(18)=0

We add all the numbers together, and all the variables

2d-21=0

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

2d=21

d=21/2

d=10+1/2

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