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8p-9=9p-12
We move all terms to the left:
8p-9-(9p-12)=0
We get rid of parentheses
8p-9p+12-9=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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