18d-21=21d+3

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



18d-21=21d+3

We move all terms to the left:

18d-21-(21d+3)=0

We get rid of parentheses

18d-21d-3-21=0

We add all the numbers together, and all the variables

-3d-24=0

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

-3d=24

d=24/-3

d=-8

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