7p-7=21

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Solution for 7p-7=21 equation: 



7p-7=21

We move all terms to the left:

7p-7-(21)=0

We add all the numbers together, and all the variables

7p-28=0

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

7p=28

p=28/7

p=4

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