3p-21=4p+20

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Solution for 3p-21=4p+20 equation: 



3p-21=4p+20

We move all terms to the left:

3p-21-(4p+20)=0

We get rid of parentheses

3p-4p-20-21=0

We add all the numbers together, and all the variables

-1p-41=0

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

-p=41

p=41/-1

p=-41

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