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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
18/p = -6 // + 6
18/p+6 = 0
18*p^-1 = -6 // : 18
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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