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8p-9(p-1)=12
We move all terms to the left:
8p-9(p-1)-(12)=0
We multiply parentheses
8p-9p+9-12=0
We add all the numbers together, and all the variables
-1p-3=0
We move all terms containing p to the left, all other terms to the right
-p=3
p=3/-1
p=-3
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