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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