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18=3d+3
We move all terms to the left:
18-(3d+3)=0
We get rid of parentheses
-3d-3+18=0
We add all the numbers together, and all the variables
-3d+15=0
We move all terms containing d to the left, all other terms to the right
-3d=-15
d=-15/-3
d=+5
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