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x in (-oo:+oo)
(x^2)/5-((3*x^1)/5)+2 = 0
(x^2)/5+(-3/5)*x+2 = 0
1/5*x^2-3/5*x+2 = 0
DELTA = (-3/5)^2-(1/5*2*4)
DELTA = -31/25
DELTA < 0
x belongs to the empty set
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