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n in (-oo:+oo)
(n^2-(6*n)+119)/42 = 0
(n^2-6*n+119)/42 = 0
n^2-6*n+119 = 0
n^2-6*n+119 = 0
DELTA = (-6)^2-(1*4*119)
DELTA = -440
DELTA < 0
1 = 0
1/42 = 0
n belongs to the empty set
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