2d+3(d+3)=21

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Solution for 2d+3(d+3)=21 equation: 



2d+3(d+3)=21

We move all terms to the left:

2d+3(d+3)-(21)=0

We multiply parentheses

2d+3d+9-21=0

We add all the numbers together, and all the variables

5d-12=0

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

5d=12

d=12/5

d=2+2/5

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