21=9p-15

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Solution for 21=9p-15 equation: 



21=9p-15

We move all terms to the left:

21-(9p-15)=0

We get rid of parentheses

-9p+15+21=0

We add all the numbers together, and all the variables

-9p+36=0

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

-9p=-36

p=-36/-9

p=+4

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