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57=3d+9
We move all terms to the left:
57-(3d+9)=0
We get rid of parentheses
-3d-9+57=0
We add all the numbers together, and all the variables
-3d+48=0
We move all terms containing d to the left, all other terms to the right
-3d=-48
d=-48/-3
d=+16
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