4d+9=21

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Solution for 4d+9=21 equation: 



4d+9=21

We move all terms to the left:

4d+9-(21)=0

We add all the numbers together, and all the variables

4d-12=0

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

4d=12

d=12/4

d=3

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