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12p-11=9p+13
We move all terms to the left:
12p-11-(9p+13)=0
We get rid of parentheses
12p-9p-13-11=0
We add all the numbers together, and all the variables
3p-24=0
We move all terms containing p to the left, all other terms to the right
3p=24
p=24/3
p=8
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