3p-21=9

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Solution for 3p-21=9 equation: 



3p-21=9

We move all terms to the left:

3p-21-(9)=0

We add all the numbers together, and all the variables

3p-30=0

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

3p=30

p=30/3

p=10

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