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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(6/x) = 8/3 // - 8/3
x-(6/x)-(8/3) = 0
x-6*x^-1-8/3 = 0
1*x^1-6*x^-1-8/3*x^0 = 0
(1*x^2-8/3*x^1-6*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-8/3*x^1-6*x^0) = 0
x^1
x^2+(-8/3)*x-6 = 0
x^2+(-8/3)*x-6 = 0
DELTA = (-8/3)^2-(-6*1*4)
DELTA = 280/9
DELTA > 0
x = ((280/9)^(1/2)-(-8/3))/(1*2) or x = (-(-8/3)-(280/9)^(1/2))/(1*2)
x = ((280/9)^(1/2)+8/3)/2 or x = (8/3-(280/9)^(1/2))/2
x in { (8/3-(280/9)^(1/2))/2, ((280/9)^(1/2)+8/3)/2}
x in { (8/3-(280/9)^(1/2))/2, ((280/9)^(1/2)+8/3)/2 }
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