3d+d-7=21

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Solution for 3d+d-7=21 equation: 



3d+d-7=21

We move all terms to the left:

3d+d-7-(21)=0

We add all the numbers together, and all the variables

4d-28=0

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

4d=28

d=28/4

d=7

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