12-2d=15

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Solution for 12-2d=15 equation: 



12-2d=15

We move all terms to the left:

12-2d-(15)=0

We add all the numbers together, and all the variables

-2d-3=0

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

-2d=3

d=3/-2

d=-1+1/2

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