12d+15-9d=39

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Solution for 12d+15-9d=39 equation: 



12d+15-9d=39

We move all terms to the left:

12d+15-9d-(39)=0

We add all the numbers together, and all the variables

3d-24=0

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

3d=24

d=24/3

d=8

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