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d=3d-19
We move all terms to the left:
d-(3d-19)=0
We get rid of parentheses
d-3d+19=0
We add all the numbers together, and all the variables
-2d+19=0
We move all terms containing d to the left, all other terms to the right
-2d=-19
d=-19/-2
d=9+1/2
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