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x in (-oo:+oo)
2*x^2+36/3 = -6*x // + -6*x
2*x^2-(-6*x)+36/3 = 0
2*x^2+6*x+36/3 = 0
2*x^2+6*x+12 = 0
DELTA = 6^2-(2*4*12)
DELTA = -60
DELTA < 0
x belongs to the empty set
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