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x in (-oo:+oo)
y*ln(y)-y = (9/2)*X^2 // - (9/2)*X^2
y*ln(y)-((9/2)*X^2)-y = 0
y*ln(y)+(-9/2)*X^2-y = 0
t_1 = ln(y)
y*ln(y)+(-9/2)*X^2-y = 0
(-9*X^2)/2+t_1*y-y = 0
(-9*X^2)/2+(2*t_1*y)/2+(2*(-y))/2 = 0
2*t_1*y-9*X^2+2*(-y) = 0
2*t_1*y-9*X^2-2*y = 0
(2*t_1*y-9*X^2-2*y)/2 = 0
(2*t_1*y-9*X^2-2*y)/2 = 0 // * 2
2*t_1*y-9*X^2-2*y = 0
x belongs to the empty set
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