p+6p=21

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Solution for p+6p=21 equation: 



p+6p=21

We move all terms to the left:

p+6p-(21)=0

We add all the numbers together, and all the variables

7p-21=0

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

7p=21

p=21/7

p=3

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