9p-9=3p+21

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Solution for 9p-9=3p+21 equation: 



9p-9=3p+21

We move all terms to the left:

9p-9-(3p+21)=0

We get rid of parentheses

9p-3p-21-9=0

We add all the numbers together, and all the variables

6p-30=0

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

6p=30

p=30/6

p=5

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