-21=-3(1+6p)

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Solution for -21=-3(1+6p) equation: 



-21=-3(1+6p)

We move all terms to the left:

-21-(-3(1+6p))=0

We add all the numbers together, and all the variables

-(-3(6p+1))-21=0



We calculate terms in parentheses: -(-3(6p+1)), so:

-3(6p+1)

We multiply parentheses

-18p-3

Back to the equation:

-(-18p-3)



We get rid of parentheses

18p+3-21=0

We add all the numbers together, and all the variables

18p-18=0

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

18p=18

p=18/18

p=1

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