21-3p=4p

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Solution for 21-3p=4p equation: 



21-3p=4p

We move all terms to the left:

21-3p-(4p)=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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