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-(p-1)=9
We move all terms to the left:
-(p-1)-(9)=0
We get rid of parentheses
-p+1-9=0
We add all the numbers together, and all the variables
-1p-8=0
We move all terms containing p to the left, all other terms to the right
-p=8
p=8/-1
p=-8
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