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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)
(9*x^2+x)/(3*x-1) = 0
9*x^2+x = 0
x*(9*x+1) = 0
9*x+1 = 0 // - 1
9*x = -1 // : 9
x = -1/9
x*(x+1/9) = 0
(x*(x+1/9))/(3*x-1) = 0
( x+1/9 )
x+1/9 = 0 // - 1/9
x = -1/9
( x )
x = 0
x in { -1/9, 0 }
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