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6d-15d-(-12d)=-9
We move all terms to the left:
6d-15d-(-12d)-(-9)=0
We add all the numbers together, and all the variables
-9d-(-12d)+9=0
We get rid of parentheses
-9d+12d+9=0
We add all the numbers together, and all the variables
3d+9=0
We move all terms containing d to the left, all other terms to the right
3d=-9
d=-9/3
d=-3
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