30=7d+9

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Solution for 30=7d+9 equation: 



30=7d+9

We move all terms to the left:

30-(7d+9)=0

We get rid of parentheses

-7d-9+30=0

We add all the numbers together, and all the variables

-7d+21=0

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

-7d=-21

d=-21/-7

d=+3

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