3+6d=21

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Solution for 3+6d=21 equation: 



3+6d=21

We move all terms to the left:

3+6d-(21)=0

We add all the numbers together, and all the variables

6d-18=0

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

6d=18

d=18/6

d=3

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