15-21=2p+4p

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Solution for 15-21=2p+4p equation: 



15-21=2p+4p

We move all terms to the left:

15-21-(2p+4p)=0

We add all the numbers together, and all the variables

-(+6p)+15-21=0

We add all the numbers together, and all the variables

-(+6p)-6=0

We get rid of parentheses

-6p-6=0

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

-6p=6

p=6/-6

p=-1

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