3p+5-7p=21

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Solution for 3p+5-7p=21 equation: 



3p+5-7p=21

We move all terms to the left:

3p+5-7p-(21)=0

We add all the numbers together, and all the variables

-4p-16=0

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

-4p=16

p=16/-4

p=-4

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