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6d-12-d=9d+
We move all terms to the left:
6d-12-d-(9d+)=0
We add all the numbers together, and all the variables
6d-d-(+9d)-12=0
We add all the numbers together, and all the variables
5d-(+9d)-12=0
We get rid of parentheses
5d-9d-12=0
We add all the numbers together, and all the variables
-4d-12=0
We move all terms containing d to the left, all other terms to the right
-4d=12
d=12/-4
d=-3
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