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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
2/10 = 20/p // - 20/p
2/10-(20/p) = 0
2/10-20*p^-1 = 0
-20*p^-1 = -1/5 // : -20
p^-1 = 1/100
-1 < 0
1/(p^1) = 1/100 // * p^1
1 = 1/100*p^1 // : 1/100
100 = p^1
p = 100
p = 100
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