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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
880/240 = 11/p // - 11/p
880/240-(11/p) = 0
880/240-11*p^-1 = 0
-11*p^-1 = -11/3 // : -11
p^-1 = 1/3
-1 < 0
1/(p^1) = 1/3 // * p^1
1 = 1/3*p^1 // : 1/3
3 = p^1
p = 3
p = 3
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