21-2d=9

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Solution for 21-2d=9 equation: 



21-2d=9

We move all terms to the left:

21-2d-(9)=0

We add all the numbers together, and all the variables

-2d+12=0

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

-2d=-12

d=-12/-2

d=+6

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