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D( P )
P = 0
P = 0
P = 0
P in (-oo:0) U (0:+oo)
5/P-(2/P)+3+3 = 0
5/P-2*P^-1+3+3 = 0
3*P^-1 = -6 // : 3
P^-1 = -2
-1 < 0
1/(P^1) = -2 // * P^1
1 = -2*P^1 // : -2
-1/2 = P^1
P = -1/2
P = -1/2
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