21=2d+d

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Solution for 21=2d+d equation: 



21=2d+d

We move all terms to the left:

21-(2d+d)=0

We add all the numbers together, and all the variables

-(+3d)+21=0

We get rid of parentheses

-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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