9d-2d+7d-13d-4d=-12

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Solution for 9d-2d+7d-13d-4d=-12 equation: 



9d-2d+7d-13d-4d=-12

We move all terms to the left:

9d-2d+7d-13d-4d-(-12)=0

We add all the numbers together, and all the variables

-3d+12=0

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

-3d=-12

d=-12/-3

d=+4

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