21=-7(p-3)

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Solution for 21=-7(p-3) equation: 



21=-7(p-3)

We move all terms to the left:

21-(-7(p-3))=0



We calculate terms in parentheses: -(-7(p-3)), so:

-7(p-3)

We multiply parentheses

-7p+21

Back to the equation:

-(-7p+21)



We get rid of parentheses

7p-21+21=0

We add all the numbers together, and all the variables

7p=0

p=0/7

p=0

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