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-18d-6=-18-20d
We move all terms to the left:
-18d-6-(-18-20d)=0
We add all the numbers together, and all the variables
-18d-(-20d-18)-6=0
We get rid of parentheses
-18d+20d+18-6=0
We add all the numbers together, and all the variables
2d+12=0
We move all terms containing d to the left, all other terms to the right
2d=-12
d=-12/2
d=-6
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