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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
120/p = 8/45 // - 8/45
120/p-(8/45) = 0
120/p-8/45 = 0
120*p^-1 = 8/45 // : 120
p^-1 = 1/675
-1 < 0
1/(p^1) = 1/675 // * p^1
1 = 1/675*p^1 // : 1/675
675 = p^1
p = 675
p = 675
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