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D( x )
3*x-4 = 0
3*x-4 = 0
3*x-4 = 0
3*x-4 = 0 // + 4
3*x = 4 // : 3
x = 4/3
x in (-oo:4/3) U (4/3:+oo)
(6*x^2-12)/(3*x-4) = 2*x // - 2*x
(6*x^2-12)/(3*x-4)-(2*x) = 0
(6*x^2-12)/(3*x-4)-2*x = 0
(6*x^2-12)/(3*x-4)+(-2*x*(3*x-4))/(3*x-4) = 0
6*x^2-2*x*(3*x-4)-12 = 0
8*x-12 = 0
(8*x-12)/(3*x-4) = 0
(8*x-12)/(3*x-4) = 0 // * 3*x-4
8*x-12 = 0
8*x-12 = 0 // + 12
8*x = 12 // : 8
x = 12/8
x = 3/2
x = 3/2
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