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11d=20d-80
We move all terms to the left:
11d-(20d-80)=0
We get rid of parentheses
11d-20d+80=0
We add all the numbers together, and all the variables
-9d+80=0
We move all terms containing d to the left, all other terms to the right
-9d=-80
d=-80/-9
d=8+8/9
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