21=-3p-9

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Solution for 21=-3p-9 equation: 



21=-3p-9

We move all terms to the left:

21-(-3p-9)=0

We get rid of parentheses

3p+9+21=0

We add all the numbers together, and all the variables

3p+30=0

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

3p=-30

p=-30/3

p=-10

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