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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x)/x-2-1 = 14/(x^2)-1 // - 14/(x^2)-1
(5*x)/x-(14/(x^2))-2-1+1 = 0
(5*x)/x-14*x^-2-2-1+1 = 0
-14*x^-2 = -3 // : -14
x^-2 = 3/14
-2 < 0
1/(x^2) = 3/14 // * x^2
1 = 3/14*x^2 // : 3/14
14/3 = x^2
x^2 = 14/3 // ^ 1/2
abs(x) = (14/3)^(1/2)
x = (14/3)^(1/2) or x = -(14/3)^(1/2)
x in { (14/3)^(1/2), -(14/3)^(1/2) }
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