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6d-3d=2d-6=4d
We move all terms to the left:
6d-3d-(2d-6)=0
We add all the numbers together, and all the variables
3d-(2d-6)=0
We get rid of parentheses
3d-2d+6=0
We add all the numbers together, and all the variables
d+6=0
We move all terms containing d to the left, all other terms to the right
d=-6
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