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x in (-oo:+oo)
(x^2)/0.1-x = 0.001 // - 0.001
(x^2)/0.1-x-0.001 = 0
10*x^2-x-0.001 = 0
DELTA = (-1)^2-(-0.001*4*10)
DELTA = 1.04
DELTA > 0
x = (1.04^(1/2)+1)/(2*10) or x = (1-1.04^(1/2))/(2*10)
x = (1.04^(1/2)+1)/20 or x = (1-1.04^(1/2))/20
x in { (1-1.04^(1/2))/20, (1.04^(1/2)+1)/20 }
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