8d-4d-d-9=6d+12

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Solution for 8d-4d-d-9=6d+12 equation: 



8d-4d-d-9=6d+12

We move all terms to the left:

8d-4d-d-9-(6d+12)=0

We add all the numbers together, and all the variables

3d-(6d+12)-9=0

We get rid of parentheses

3d-6d-12-9=0

We add all the numbers together, and all the variables

-3d-21=0

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

-3d=21

d=21/-3

d=-7

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