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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-3)/x = 5/8 // - 5/8
(x-3)/x-(5/8) = 0
(x-3)/x-5/8 = 0
(8*(x-3))/(8*x)+(-5*x)/(8*x) = 0
8*(x-3)-5*x = 0
3*x-24 = 0
(3*x-24)/(8*x) = 0
(3*x-24)/(8*x) = 0 // * 8*x
3*x-24 = 0
3*x-24 = 0 // + 24
3*x = 24 // : 3
x = 24/3
x = 8
x = 8
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