d+6d=21=14

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Solution for d+6d=21=14 equation: 



d+6d=21=14

We move all terms to the left:

d+6d-(21)=0

We add all the numbers together, and all the variables

7d-21=0

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

7d=21

d=21/7

d=3

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