20=11+p

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Solution for 20=11+p equation: 



20=11+p

We move all terms to the left:

20-(11+p)=0

We add all the numbers together, and all the variables

-(p+11)+20=0

We get rid of parentheses

-p-11+20=0

We add all the numbers together, and all the variables

-1p+9=0

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

-p=-9

p=-9/-1

p=+9

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