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-10d=20-8d
We move all terms to the left:
-10d-(20-8d)=0
We add all the numbers together, and all the variables
-10d-(-8d+20)=0
We get rid of parentheses
-10d+8d-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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