12d-2d-1=9

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Solution for 12d-2d-1=9 equation: 



12d-2d-1=9

We move all terms to the left:

12d-2d-1-(9)=0

We add all the numbers together, and all the variables

10d-10=0

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

10d=10

d=10/10

d=1

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