12-d=-7

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Solution for 12-d=-7 equation: 



12-d=-7

We move all terms to the left:

12-d-(-7)=0

We add all the numbers together, and all the variables

-1d+19=0

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

-d=-19

d=-19/-1

d=+19

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