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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)
(5*x+1)/(3*x-1) = 0
5*x+1 = 0 // - 1
5*x = -1 // : 5
x = -1/5
x = -1/5
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