d+9=2d

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Solution for d+9=2d equation: 



d+9=2d

We move all terms to the left:

d+9-(2d)=0

We add all the numbers together, and all the variables

-1d+9=0

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

-d=-9

d=-9/-1

d=+9

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