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D( p )
p^3 = 0
p^3 = 0
p^3 = 0
1*p^3 = 0 // : 1
p^3 = 0
p = 0
p in (-oo:0) U (0:+oo)
9 = 320/(p^3) // - 320/(p^3)
9-(320/(p^3)) = 0
9-320*p^-3 = 0
-320*p^-3 = -9 // : -320
p^-3 = 9/320
-3 < 0
1/(p^3) = 9/320 // * p^3
1 = 9/320*p^3 // : 9/320
320/9 = p^3
p^3 = 320/9 // ^ 1/3
p = (320/9)^(1/3)
p = (320/9)^(1/3)
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