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-2(d+8)=-20
We move all terms to the left:
-2(d+8)-(-20)=0
We add all the numbers together, and all the variables
-2(d+8)+20=0
We multiply parentheses
-2d-16+20=0
We add all the numbers together, and all the variables
-2d+4=0
We move all terms containing d to the left, all other terms to the right
-2d=-4
d=-4/-2
d=+2
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