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n in (-oo:+oo)
(1/9)*n^2 = (2/9)*n-5 // - (2/9)*n-5
(1/9)*n^2-((2/9)*n)+5 = 0
(1/9)*n^2+(-2/9)*n+5 = 0
1/9*n^2-2/9*n+5 = 0
DELTA = (-2/9)^2-(1/9*4*5)
DELTA = -176/81
DELTA < 0
n belongs to the empty set
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