-21=9-p

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Solution for -21=9-p equation: 



-21=9-p

We move all terms to the left:

-21-(9-p)=0

We add all the numbers together, and all the variables

-(-1p+9)-21=0

We get rid of parentheses

1p-9-21=0

We add all the numbers together, and all the variables

p-30=0

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

p=30

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