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x in (-oo:+oo)
12*x^2-((3/6)*x^2)+5*x-(2*x) = 0
12*x^2+(-1/2)*x^2+5*x-2*x = 0
23/2*x^2+3*x = 0
DELTA = 3^2-(0*4*23/2)
DELTA = 9
DELTA > 0
x = (9^(1/2)-3)/(2*23/2) or x = (-9^(1/2)-3)/(2*23/2)
x = 0 or x = -6/23
x in { -6/23, 0 }
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