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p in (-oo:+oo)
(50-(5*p)-5)/10 = 0
(50-5*p-5)/10 = 0
(45-5*p)/10 = 0
45-5*p = 0 // - 45
-5*p = -45 // : -5
p = -45/(-5)
p = 9
p = 9
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