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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(3/x) = 6/5 // - 6/5
x-(3/x)-(6/5) = 0
x-3*x^-1-6/5 = 0
1*x^1-3*x^-1-6/5*x^0 = 0
(1*x^2-6/5*x^1-3*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-6/5*x^1-3*x^0) = 0
x^1
x^2+(-6/5)*x-3 = 0
x^2+(-6/5)*x-3 = 0
DELTA = (-6/5)^2-(-3*1*4)
DELTA = 336/25
DELTA > 0
x = ((336/25)^(1/2)-(-6/5))/(1*2) or x = (-(-6/5)-(336/25)^(1/2))/(1*2)
x = ((336/25)^(1/2)+6/5)/2 or x = (6/5-(336/25)^(1/2))/2
x in { (6/5-(336/25)^(1/2))/2, ((336/25)^(1/2)+6/5)/2}
x in { (6/5-(336/25)^(1/2))/2, ((336/25)^(1/2)+6/5)/2 }
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