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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
210/p = 2/3 // - 2/3
210/p-(2/3) = 0
210/p-2/3 = 0
210*p^-1 = 2/3 // : 210
p^-1 = 1/315
-1 < 0
1/(p^1) = 1/315 // * p^1
1 = 1/315*p^1 // : 1/315
315 = p^1
p = 315
p = 315
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