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-6d-14d+11d+7d=-20
We move all terms to the left:
-6d-14d+11d+7d-(-20)=0
We add all the numbers together, and all the variables
-2d+20=0
We move all terms containing d to the left, all other terms to the right
-2d=-20
d=-20/-2
d=+10
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