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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
476/14 = 578/p // - 578/p
476/14-(578/p) = 0
476/14-578*p^-1 = 0
-578*p^-1 = -34 // : -578
p^-1 = 1/17
-1 < 0
1/(p^1) = 1/17 // * p^1
1 = 1/17*p^1 // : 1/17
17 = p^1
p = 17
p = 17
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