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3-2d=4d-15
We move all terms to the left:
3-2d-(4d-15)=0
We get rid of parentheses
-2d-4d+15+3=0
We add all the numbers together, and all the variables
-6d+18=0
We move all terms containing d to the left, all other terms to the right
-6d=-18
d=-18/-6
d=+3
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