2d-9=9d-9-7d

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Solution for 2d-9=9d-9-7d equation: 



2d-9=9d-9-7d

We move all terms to the left:

2d-9-(9d-9-7d)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

2d-2d+9-9=0

We add all the numbers together, and all the variables

=0

d=0/1

d=0

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