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P in (-oo:+oo)
-7 = P/9-5 // - P/9-5
5-(P/9)-7 = 0
-1/9*P-2 = 0 // + 2
-1/9*P = 2 // : -1/9
P = 2/(-1/9)
P = -18
P = -18
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