4d+2d+1=21

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Solution for 4d+2d+1=21 equation: 



4d+2d+1=21

We move all terms to the left:

4d+2d+1-(21)=0

We add all the numbers together, and all the variables

6d-20=0

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

6d=20

d=20/6

d=3+1/3

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