21=3p-6

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Solution for 21=3p-6 equation: 



21=3p-6

We move all terms to the left:

21-(3p-6)=0

We get rid of parentheses

-3p+6+21=0

We add all the numbers together, and all the variables

-3p+27=0

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

-3p=-27

p=-27/-3

p=+9

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