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-2=2d-18
We move all terms to the left:
-2-(2d-18)=0
We get rid of parentheses
-2d+18-2=0
We add all the numbers together, and all the variables
-2d+16=0
We move all terms containing d to the left, all other terms to the right
-2d=-16
d=-16/-2
d=+8
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