21=3+8p

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Solution for 21=3+8p equation: 



21=3+8p

We move all terms to the left:

21-(3+8p)=0

We add all the numbers together, and all the variables

-(8p+3)+21=0

We get rid of parentheses

-8p-3+21=0

We add all the numbers together, and all the variables

-8p+18=0

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

-8p=-18

p=-18/-8

p=2+1/4

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