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D( x )
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0 // + 1
3*x = 1 // : 3
x = 1/3
x in (-oo:1/3) U (1/3:+oo)
(3*x^2)/(3*x-1) = 0
3*x^2 = 0 // : 3
x^2 = 0
x = 0
x = 0
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