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D( x )
(6*x-4)/(x^2-5) = 0
x^2-5 = 0
(6*x-4)/(x^2-5) = 0
(6*x-4)/(x^2-5) = 0
6*x-4 = 0 // + 4
6*x = 4 // : 6
x = 4/6
x = 2/3
x^2-5 = 0
x^2-5 = 0
1*x^2 = 5 // : 1
x^2 = 5
x^2 = 5 // ^ 1/2
abs(x) = 5^(1/2)
x = 5^(1/2) or x = -5^(1/2)
x in (-oo:-5^(1/2)) U (-5^(1/2):2/3) U (2/3:5^(1/2)) U (5^(1/2):+oo)
((3*x+1)/(x^2-5))/((6*x-4)/(x^2-5)) = 0
((3*x+1)*(x^2-5))/((x^2-5)*(6*x-4)) = 0
(3*x+1)/(6*x-4) = 0
3*x+1 = 0 // - 1
3*x = -1 // : 3
x = -1/3
x = -1/3
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