21=p-10

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Solution for 21=p-10 equation: 



21=p-10

We move all terms to the left:

21-(p-10)=0

We get rid of parentheses

-p+10+21=0

We add all the numbers together, and all the variables

-1p+31=0

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

-p=-31

p=-31/-1

p=+31

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