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x in (-oo:+oo)
0.5*x^2-(1.5*((x^2)/3)) = -0.85 // + 0.85
0.5*x^2-(1.5*((x^2)/3))+0.85 = 0
0.5*x^2-0.5*x^2+0.85 = 0
0.85 = 0
x belongs to the empty set
x belongs to the empty set
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