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