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P in (-oo:+oo)
(-15/22)*P = 5/11 // - 5/11
(-15/22)*P-(5/11) = 0
(-15/22)*P-5/11 = 0
-15/22*P-5/11 = 0 // + 5/11
-15/22*P = 5/11 // : -15/22
P = 5/11/(-15/22)
P = -2/3
P = -2/3
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