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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(-5/x)*(10/x-2) = -3/x // + -3/x
(-5/x)*(10/x-2)-(-3/x) = 0
(-5/x)*(10/x-2)+3*x^-1 = 0
3/x-5*x^-1*(10*x^-1-2) = 0
(-5*x^-1*x*(10*x^-1-2))/x+3/x = 0
3-5*x^-1*x*(10*x^-1-2) = 0
13-50*x^-1 = 0
(13-50*x^-1)/x = 0
(13-50*x^-1)/x = 0 // * x
13-50*x^-1 = 0
-50*x^-1 = -13 // : -50
x^-1 = 13/50
-1 < 0
1/(x^1) = 13/50 // * x^1
1 = 13/50*x^1 // : 13/50
50/13 = x^1
x = 50/13
x = 50/13
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