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x in (-oo:+oo)
x-((x^2)/12)-2 = 0
x-1/12*x^2-2 = 0
DELTA = 1^2-(-2*(-1/12)*4)
DELTA = 1/3
DELTA > 0
x = ((1/3)^(1/2)-1)/(-1/12*2) or x = (-(1/3)^(1/2)-1)/(-1/12*2)
x = -6*((1/3)^(1/2)-1) or x = 6*((1/3)^(1/2)+1)
x in { -6*((1/3)^(1/2)-1), 6*((1/3)^(1/2)+1) }
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