-2p+5p=-21

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Solution for -2p+5p=-21 equation: 



-2p+5p=-21

We move all terms to the left:

-2p+5p-(-21)=0

We add all the numbers together, and all the variables

3p+21=0

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

3p=-21

p=-21/3

p=-7

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