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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
90-(2*p) = p/p-3 // - p/p-3
3-(2*p)-(p/p)+90 = 0
3-2*p-1+90 = 0
92-2*p = 0 // - 92
-2*p = -92 // : -2
p = -92/(-2)
p = 46
p = 46
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