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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
8/p+10 = 4/9 // - 4/9
8/p-(4/9)+10 = 0
8/p-4/9+10 = 0
8*p^-1 = -86/9 // : 8
p^-1 = -43/36
-1 < 0
1/(p^1) = -43/36 // * p^1
1 = -43/36*p^1 // : -43/36
-36/43 = p^1
p = -36/43
p = -36/43
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