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D( P )
P = 0
P = 0
P = 0
P in (-oo:0) U (0:+oo)
(P-5)/P = 0.333 // - 0.333
(P-5)/P-0.333 = 0
(P-5)/P+(-0.333*P)/P = 0
P-0.333*P-5 = 0
0.667*P-5 = 0
(0.667*P-5)/P = 0
(0.667*P-5)/P = 0 // * P
0.667*P-5 = 0
0.667*P-5 = 0 // + 5
0.667*P = 5 // : 0.667
P = 5/0.667
P = 7.49625187
P = 7.49625187
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