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n in (-oo:+oo)
3*n-((3/6)*n^2)-(6*n) = 0
(-1/2)*n^2+3*n-6*n = 0
-1/2*n^2-3*n = 0
DELTA = (-3)^2-(-1/2*0*4)
DELTA = 9
DELTA > 0
n = (9^(1/2)+3)/(-1/2*2) or n = (3-9^(1/2))/(-1/2*2)
n = -6 or n = 0
n in { -6, 0 }
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