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D( P )
9300-(8*P) = 0
9300-(8*P) = 0
9300-(8*P) = 0
9300-8*P = 0
9300-8*P = 0 // - 9300
-8*P = -9300 // : -8
P = -9300/(-8)
P = 2325/2
P in (-oo:2325/2) U (2325/2:+oo)
(-8*P)/(9300-(8*P)) = -2.4 // + 2.4
(-8*P)/(9300-(8*P))+2.4 = 0
(-8*P)/(9300-8*P)+2.4 = 0
(-8*P)/(9300-8*P)+(2.4*(9300-8*P))/(9300-8*P) = 0
2.4*(9300-8*P)-8*P = 0
22320-27.2*P = 0
(22320-27.2*P)/(9300-8*P) = 0
(22320-27.2*P)/(9300-8*P) = 0 // * 9300-8*P
22320-27.2*P = 0
22320-27.2*P = 0 // - 22320
-27.2*P = -22320 // : -27.2
P = -22320/(-27.2)
P = 820.58823529
P = 820.58823529
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