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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
2.5/5 = 8/p // - 8/p
2.5/5-(8/p) = 0
2.5/5-8*p^-1 = 0
-8*p^-1 = -0.5 // : -8
p^-1 = 0.0625
-1 < 0
1/(p^1) = 0.0625 // * p^1
1 = 0.0625*p^1 // : 0.0625
16 = p^1
p = 16
p = 16
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