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20=8+p
We move all terms to the left:
20-(8+p)=0
We add all the numbers together, and all the variables
-(p+8)+20=0
We get rid of parentheses
-p-8+20=0
We add all the numbers together, and all the variables
-1p+12=0
We move all terms containing p to the left, all other terms to the right
-p=-12
p=-12/-1
p=+12
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