9d-7=20

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Solution for 9d-7=20 equation: 



9d-7=20

We move all terms to the left:

9d-7-(20)=0

We add all the numbers together, and all the variables

9d-27=0

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

9d=27

d=27/9

d=3

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