21=p-2

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Solution for 21=p-2 equation: 



21=p-2

We move all terms to the left:

21-(p-2)=0

We get rid of parentheses

-p+2+21=0

We add all the numbers together, and all the variables

-1p+23=0

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

-p=-23

p=-23/-1

p=+23

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