d=21-3d

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Solution for d=21-3d equation: 



d=21-3d

We move all terms to the left:

d-(21-3d)=0

We add all the numbers together, and all the variables

d-(-3d+21)=0

We get rid of parentheses

d+3d-21=0

We add all the numbers together, and all the variables

4d-21=0

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

4d=21

d=21/4

d=5+1/4

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