12+7d=3d

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Solution for 12+7d=3d equation: 



12+7d=3d

We move all terms to the left:

12+7d-(3d)=0

We add all the numbers together, and all the variables

4d+12=0

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

4d=-12

d=-12/4

d=-3

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