31=p+20

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Solution for 31=p+20 equation: 



31=p+20

We move all terms to the left:

31-(p+20)=0

We get rid of parentheses

-p-20+31=0

We add all the numbers together, and all the variables

-1p+11=0

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

-p=-11

p=-11/-1

p=+11

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