18d-21=15d=3

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Solution for 18d-21=15d=3 equation: 



18d-21=15d=3

We move all terms to the left:

18d-21-(15d)=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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