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-12=4d+8
We move all terms to the left:
-12-(4d+8)=0
We get rid of parentheses
-4d-8-12=0
We add all the numbers together, and all the variables
-4d-20=0
We move all terms containing d to the left, all other terms to the right
-4d=20
d=20/-4
d=-5
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