9d-12=3d+21

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Solution for 9d-12=3d+21 equation: 



9d-12=3d+21

We move all terms to the left:

9d-12-(3d+21)=0

We get rid of parentheses

9d-3d-21-12=0

We add all the numbers together, and all the variables

6d-33=0

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

6d=33

d=33/6

d=5+1/2

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