d-4d=9

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Solution for d-4d=9 equation: 



d-4d=9

We move all terms to the left:

d-4d-(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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