12d+6=-30-9d

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Solution for 12d+6=-30-9d equation: 



12d+6=-30-9d

We move all terms to the left:

12d+6-(-30-9d)=0

We add all the numbers together, and all the variables

12d-(-9d-30)+6=0

We get rid of parentheses

12d+9d+30+6=0

We add all the numbers together, and all the variables

21d+36=0

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

21d=-36

d=-36/21

d=-1+5/7

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