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-15=2P+11
We move all terms to the left:
-15-(2P+11)=0
We get rid of parentheses
-2P-11-15=0
We add all the numbers together, and all the variables
-2P-26=0
We move all terms containing P to the left, all other terms to the right
-2P=26
P=26/-2
P=-13
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