-9=2d-d

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Solution for -9=2d-d equation: 



-9=2d-d

We move all terms to the left:

-9-(2d-d)=0

We add all the numbers together, and all the variables

-(+d)-9=0

We get rid of parentheses

-d-9=0

We add all the numbers together, and all the variables

-1d-9=0

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

-d=9

d=9/-1

d=-9

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