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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-2)/x = 12/20 // - 12/20
(x-2)/x-(12/20) = 0
(x-2)/x-3/5 = 0
(5*(x-2))/(5*x)+(-3*x)/(5*x) = 0
5*(x-2)-3*x = 0
2*x-10 = 0
(2*x-10)/(5*x) = 0
(2*x-10)/(5*x) = 0 // * 5*x
2*x-10 = 0
2*x-10 = 0 // + 10
2*x = 10 // : 2
x = 10/2
x = 5
x = 5
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