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-9+15P=16P+11
We move all terms to the left:
-9+15P-(16P+11)=0
We get rid of parentheses
15P-16P-11-9=0
We add all the numbers together, and all the variables
-1P-20=0
We move all terms containing P to the left, all other terms to the right
-P=20
P=20/-1
P=-20
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