-1d-9=12

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Solution for -1d-9=12 equation: 



-1d-9=12

We move all terms to the left:

-1d-9-(12)=0

We add all the numbers together, and all the variables

-1d-21=0

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

-d=21

d=21/-1

d=-21

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