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x in (-oo:+oo)
6*x^2+5/2 = 8*x // - 8*x
6*x^2-(8*x)+5/2 = 0
6*x^2-8*x+5/2 = 0
6*x^2-8*x+5/2 = 0
DELTA = (-8)^2-(5/2*4*6)
DELTA = 4
DELTA > 0
x = (4^(1/2)+8)/(2*6) or x = (8-4^(1/2))/(2*6)
x = 5/6 or x = 1/2
x in { 1/2, 5/6 }
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