2d-9=8d+9

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Solution for 2d-9=8d+9 equation: 



2d-9=8d+9

We move all terms to the left:

2d-9-(8d+9)=0

We get rid of parentheses

2d-8d-9-9=0

We add all the numbers together, and all the variables

-6d-18=0

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

-6d=18

d=18/-6

d=-3

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