30=12+9d

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Solution for 30=12+9d equation: 



30=12+9d

We move all terms to the left:

30-(12+9d)=0

We add all the numbers together, and all the variables

-(9d+12)+30=0

We get rid of parentheses

-9d-12+30=0

We add all the numbers together, and all the variables

-9d+18=0

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

-9d=-18

d=-18/-9

d=+2

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