30d-7=4d+9

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Solution for 30d-7=4d+9 equation: 



30d-7=4d+9

We move all terms to the left:

30d-7-(4d+9)=0

We get rid of parentheses

30d-4d-9-7=0

We add all the numbers together, and all the variables

26d-16=0

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

26d=16

d=16/26

d=8/13

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