2p+p=21

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Solution for 2p+p=21 equation: 



2p+p=21

We move all terms to the left:

2p+p-(21)=0

We add all the numbers together, and all the variables

3p-21=0

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

3p=21

p=21/3

p=7

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