-3p-(p-1)=21

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Solution for -3p-(p-1)=21 equation: 



-3p-(p-1)=21

We move all terms to the left:

-3p-(p-1)-(21)=0

We get rid of parentheses

-3p-p+1-21=0

We add all the numbers together, and all the variables

-4p-20=0

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

-4p=20

p=20/-4

p=-5

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