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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
6 = 1560/p // - 1560/p
6-(1560/p) = 0
6-1560*p^-1 = 0
-1560*p^-1 = -6 // : -1560
p^-1 = 1/260
-1 < 0
1/(p^1) = 1/260 // * p^1
1 = 1/260*p^1 // : 1/260
260 = p^1
p = 260
p = 260
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