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-3(P+1)=9
We move all terms to the left:
-3(P+1)-(9)=0
We multiply parentheses
-3P-3-9=0
We add all the numbers together, and all the variables
-3P-12=0
We move all terms containing P to the left, all other terms to the right
-3P=12
P=12/-3
P=-4
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