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10d+20=-5d-20+10d
We move all terms to the left:
10d+20-(-5d-20+10d)=0
We add all the numbers together, and all the variables
10d-(5d-20)+20=0
We get rid of parentheses
10d-5d+20+20=0
We add all the numbers together, and all the variables
5d+40=0
We move all terms containing d to the left, all other terms to the right
5d=-40
d=-40/5
d=-8
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