3+2d=21

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Solution for 3+2d=21 equation: 



3+2d=21

We move all terms to the left:

3+2d-(21)=0

We add all the numbers together, and all the variables

2d-18=0

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

2d=18

d=18/2

d=9

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