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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
8/5 = 4/p+9 // - 4/p+9
8/5-(4/p)-9 = 0
8/5-4*p^-1-9 = 0
-4*p^-1 = 37/5 // : -4
p^-1 = -37/20
-1 < 0
1/(p^1) = -37/20 // * p^1
1 = -37/20*p^1 // : -37/20
-20/37 = p^1
p = -20/37
p = -20/37
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