-21-3p=-3(1-2p)

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Solution for -21-3p=-3(1-2p) equation: 



-21-3p=-3(1-2p)

We move all terms to the left:

-21-3p-(-3(1-2p))=0

We add all the numbers together, and all the variables

-3p-(-3(-2p+1))-21=0



We calculate terms in parentheses: -(-3(-2p+1)), so:

-3(-2p+1)

We multiply parentheses

6p-3

Back to the equation:

-(6p-3)



We get rid of parentheses

-3p-6p+3-21=0

We add all the numbers together, and all the variables

-9p-18=0

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

-9p=18

p=18/-9

p=-2

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