7d-3d+10=9+21

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Solution for 7d-3d+10=9+21 equation: 



7d-3d+10=9+21

We move all terms to the left:

7d-3d+10-(9+21)=0

We add all the numbers together, and all the variables

7d-3d+10-30=0

We add all the numbers together, and all the variables

4d-20=0

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

4d=20

d=20/4

d=5

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