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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
20/15 = 60/p // - 60/p
20/15-(60/p) = 0
20/15-60*p^-1 = 0
-60*p^-1 = -4/3 // : -60
p^-1 = 1/45
-1 < 0
1/(p^1) = 1/45 // * p^1
1 = 1/45*p^1 // : 1/45
45 = p^1
p = 45
p = 45
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