21-3p=3(-4p-8)

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Solution for 21-3p=3(-4p-8) equation: 



21-3p=3(-4p-8)

We move all terms to the left:

21-3p-(3(-4p-8))=0



We calculate terms in parentheses: -(3(-4p-8)), so:

3(-4p-8)

We multiply parentheses

-12p-24

Back to the equation:

-(-12p-24)



We get rid of parentheses

-3p+12p+24+21=0

We add all the numbers together, and all the variables

9p+45=0

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

9p=-45

p=-45/9

p=-5

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