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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
1.5/6 = 10/p // - 10/p
1.5/6-(10/p) = 0
1.5/6-10*p^-1 = 0
-10*p^-1 = -0.25 // : -10
p^-1 = 0.025
-1 < 0
1/(p^1) = 0.025 // * p^1
1 = 0.025*p^1 // : 0.025
40 = p^1
p = 40
p = 40
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