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