7d-9=7+9d

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



7d-9=7+9d

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

7d-9d-7-9=0

We add all the numbers together, and all the variables

-2d-16=0

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

-2d=16

d=16/-2

d=-8

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