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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
7/p = 1/4 // - 1/4
7/p-(1/4) = 0
7/p-1/4 = 0
7*p^-1 = 1/4 // : 7
p^-1 = 1/28
-1 < 0
1/(p^1) = 1/28 // * p^1
1 = 1/28*p^1 // : 1/28
28 = p^1
p = 28
p = 28
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