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8d+10=-10-10-7d
We move all terms to the left:
8d+10-(-10-10-7d)=0
We add all the numbers together, and all the variables
8d-(-7d-20)+10=0
We get rid of parentheses
8d+7d+20+10=0
We add all the numbers together, and all the variables
15d+30=0
We move all terms containing d to the left, all other terms to the right
15d=-30
d=-30/15
d=-2
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