4d=d+9

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Solution for 4d=d+9 equation: 



4d=d+9

We move all terms to the left:

4d-(d+9)=0

We get rid of parentheses

4d-d-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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