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11-9d=-10d-20+11
We move all terms to the left:
11-9d-(-10d-20+11)=0
We add all the numbers together, and all the variables
-9d-(-10d-9)+11=0
We get rid of parentheses
-9d+10d+9+11=0
We add all the numbers together, and all the variables
d+20=0
We move all terms containing d to the left, all other terms to the right
d=-20
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