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x in (-oo:+oo)
x^2-((9/2)*x)+2 = 0
x^2+(-9/2)*x+2 = 0
x^2-9/2*x+2 = 0
DELTA = (-9/2)^2-(1*2*4)
DELTA = 49/4
DELTA > 0
x = ((49/4)^(1/2)+9/2)/(1*2) or x = (9/2-(49/4)^(1/2))/(1*2)
x = 4 or x = 1/2
x in { 1/2, 4 }
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