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18=2d+8
We move all terms to the left:
18-(2d+8)=0
We get rid of parentheses
-2d-8+18=0
We add all the numbers together, and all the variables
-2d+10=0
We move all terms containing d to the left, all other terms to the right
-2d=-10
d=-10/-2
d=+5
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