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x in (-oo:+oo)
3*x^2-(4*x)-x-(4/2) = 0
3*x^2-4*x-x-2 = 0
3*x^2-5*x-2 = 0
DELTA = (-5)^2-(-2*3*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)+5)/(2*3) or x = (5-49^(1/2))/(2*3)
x = 2 or x = -1/3
x in { -1/3, 2 }
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