21=3+p

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Solution for 21=3+p equation: 



21=3+p

We move all terms to the left:

21-(3+p)=0

We add all the numbers together, and all the variables

-(p+3)+21=0

We get rid of parentheses

-p-3+21=0

We add all the numbers together, and all the variables

-1p+18=0

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

-p=-18

p=-18/-1

p=+18

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