-20-2d=15+2-+9d

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Solution for -20-2d=15+2-+9d equation: 



-20-2d=15+2-+9d

We move all terms to the left:

-20-2d-(15+2-+9d)=0

We add all the numbers together, and all the variables

-2d-(+9d)-20=0

We get rid of parentheses

-2d-9d-20=0

We add all the numbers together, and all the variables

-11d-20=0

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

-11d=20

d=20/-11

d=-1+9/11

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