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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
5/p = 10/4 // - 10/4
5/p-(10/4) = 0
5/p-5/2 = 0
5*p^-1 = 5/2 // : 5
p^-1 = 1/2
-1 < 0
1/(p^1) = 1/2 // * p^1
1 = 1/2*p^1 // : 1/2
2 = p^1
p = 2
p = 2
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