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x in (-oo:+oo)
(x^2)/5-((10*x^1)/5)+9 = 0
(x^2)/5-2*x+9 = 0
1/5*x^2-2*x+9 = 0
DELTA = (-2)^2-(1/5*4*9)
DELTA = -16/5
DELTA < 0
x belongs to the empty set
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