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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
12/p = 36/45 // - 36/45
12/p-(36/45) = 0
12/p-4/5 = 0
12*p^-1 = 4/5 // : 12
p^-1 = 1/15
-1 < 0
1/(p^1) = 1/15 // * p^1
1 = 1/15*p^1 // : 1/15
15 = p^1
p = 15
p = 15
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