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D( x )
5*x-1 = 0
5*x-1 = 0
5*x-1 = 0
5*x-1 = 0 // + 1
5*x = 1 // : 5
x = 1/5
x in (-oo:1/5) U (1/5:+oo)
(x^2)/(5*x-1) = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x = 0
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