9d-4d=30

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Solution for 9d-4d=30 equation: 



9d-4d=30

We move all terms to the left:

9d-4d-(30)=0

We add all the numbers together, and all the variables

5d-30=0

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

5d=30

d=30/5

d=6

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