-9-p=-21

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Solution for -9-p=-21 equation: 



-9-p=-21

We move all terms to the left:

-9-p-(-21)=0

We add all the numbers together, and all the variables

-1p+12=0

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

-p=-12

p=-12/-1

p=+12

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