21=4.2p

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Solution for 21=4.2p equation: 



21=4.2p

We move all terms to the left:

21-(4.2p)=0

We add all the numbers together, and all the variables

-(+4.2p)+21=0

We get rid of parentheses

-4.2p+21=0

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

-4.2p=-21

p=-21/-4.2

p=+5

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