-3p+21=15

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Solution for -3p+21=15 equation: 



-3p+21=15

We move all terms to the left:

-3p+21-(15)=0

We add all the numbers together, and all the variables

-3p+6=0

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

-3p=-6

p=-6/-3

p=+2

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