20d-11d=9

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Solution for 20d-11d=9 equation: 



20d-11d=9

We move all terms to the left:

20d-11d-(9)=0

We add all the numbers together, and all the variables

9d-9=0

We move all terms containing d to the left, all other terms to the right

9d=9

d=9/9

d=1

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