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11=20-p
We move all terms to the left:
11-(20-p)=0
We add all the numbers together, and all the variables
-(-1p+20)+11=0
We get rid of parentheses
1p-20+11=0
We add all the numbers together, and all the variables
p-9=0
We move all terms containing p to the left, all other terms to the right
p=9
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