9d+12=7d

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Solution for 9d+12=7d equation: 



9d+12=7d

We move all terms to the left:

9d+12-(7d)=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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