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3d+20=-9d-20-20
We move all terms to the left:
3d+20-(-9d-20-20)=0
We add all the numbers together, and all the variables
3d-(-9d-40)+20=0
We get rid of parentheses
3d+9d+40+20=0
We add all the numbers together, and all the variables
12d+60=0
We move all terms containing d to the left, all other terms to the right
12d=-60
d=-60/12
d=-5
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