2p+1=21

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Solution for 2p+1=21 equation: 



2p+1=21

We move all terms to the left:

2p+1-(21)=0

We add all the numbers together, and all the variables

2p-20=0

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

2p=20

p=20/2

p=10

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