9+9d=7d+8d-9

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Solution for 9+9d=7d+8d-9 equation: 



9+9d=7d+8d-9

We move all terms to the left:

9+9d-(7d+8d-9)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

9d-15d+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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