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X in (-oo:+oo)
(X^2)/0.1+0.01*X-X = 0
10*X^2-0.99*X = 0
DELTA = (-0.99)^2-(0*4*10)
DELTA = 0.99^2
DELTA = 0.9801
DELTA > 0
X = ((0.99^2)^(1/2)+0.99)/(2*10) or X = (0.99-(0.99^2)^(1/2))/(2*10)
X = 0.099 or X = 0
X in { 0, 0.099 }
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