7d-9=30

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Solution for 7d-9=30 equation: 



7d-9=30

We move all terms to the left:

7d-9-(30)=0

We add all the numbers together, and all the variables

7d-39=0

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

7d=39

d=39/7

d=5+4/7

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