7d+3d=20

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Solution for 7d+3d=20 equation: 



7d+3d=20

We move all terms to the left:

7d+3d-(20)=0

We add all the numbers together, and all the variables

10d-20=0

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

10d=20

d=20/10

d=2

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