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n in (-oo:+oo)
(1/6)*n-((4/6)*n^2)+7*n-7 = 0
(-2/3)*n^2+(1/6)*n+7*n-7 = 0
43/6*n-2/3*n^2-7 = 0
DELTA = (43/6)^2-(-7*(-2/3)*4)
DELTA = 1177/36
DELTA > 0
n = ((1177/36)^(1/2)-43/6)/(-2/3*2) or n = (-(1177/36)^(1/2)-43/6)/(-2/3*2)
n = -3/4*((1177/36)^(1/2)-43/6) or n = 3/4*((1177/36)^(1/2)+43/6)
n in { -3/4*((1177/36)^(1/2)-43/6), 3/4*((1177/36)^(1/2)+43/6) }
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