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x in (-oo:+oo)
0.5 = (x/3)*x+5 // - (x/3)*x+5
0.5-((x/3)*x)-5 = 0
(-1/3)*x^2-5+0.5 = 0
-1/3*x^2 = 4.5 // : -1/3
x^2 = -13.50000014
x belongs to the empty set
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