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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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