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12=18-2d
We move all terms to the left:
12-(18-2d)=0
We add all the numbers together, and all the variables
-(-2d+18)+12=0
We get rid of parentheses
2d-18+12=0
We add all the numbers together, and all the variables
2d-6=0
We move all terms containing d to the left, all other terms to the right
2d=6
d=6/2
d=3
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