10d+9=3d-9+9d

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Solution for 10d+9=3d-9+9d equation: 



10d+9=3d-9+9d

We move all terms to the left:

10d+9-(3d-9+9d)=0

We add all the numbers together, and all the variables

10d-(12d-9)+9=0

We get rid of parentheses

10d-12d+9+9=0

We add all the numbers together, and all the variables

-2d+18=0

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

-2d=-18

d=-18/-2

d=+9

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