9d+11=11d-9

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Solution for 9d+11=11d-9 equation: 



9d+11=11d-9

We move all terms to the left:

9d+11-(11d-9)=0

We get rid of parentheses

9d-11d+9+11=0

We add all the numbers together, and all the variables

-2d+20=0

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

-2d=-20

d=-20/-2

d=+10

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