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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
1.5/10 = 10/p // - 10/p
1.5/10-(10/p) = 0
1.5/10-10*p^-1 = 0
-10*p^-1 = -0.15 // : -10
p^-1 = 0.015
-1 < 0
1/(p^1) = 0.015 // * p^1
1 = 0.015*p^1 // : 0.015
66.66666667 = p^1
p = 66.66666667
p = 66.66666667
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