6+3d=21

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Solution for 6+3d=21 equation: 



6+3d=21

We move all terms to the left:

6+3d-(21)=0

We add all the numbers together, and all the variables

3d-15=0

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

3d=15

d=15/3

d=5

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