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10+9d=-10-d
We move all terms to the left:
10+9d-(-10-d)=0
We add all the numbers together, and all the variables
9d-(-1d-10)+10=0
We get rid of parentheses
9d+1d+10+10=0
We add all the numbers together, and all the variables
10d+20=0
We move all terms containing d to the left, all other terms to the right
10d=-20
d=-20/10
d=-2
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