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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
6/p = 7/15 // - 7/15
6/p-(7/15) = 0
6/p-7/15 = 0
6*p^-1 = 7/15 // : 6
p^-1 = 7/90
-1 < 0
1/(p^1) = 7/90 // * p^1
1 = 7/90*p^1 // : 7/90
90/7 = p^1
p = 90/7
p = 90/7
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