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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)
(5*x-6)/(3*x-4) = 2 // - 2
(5*x-6)/(3*x-4)-2 = 0
(5*x-6)/(3*x-4)+(-2*(3*x-4))/(3*x-4) = 0
5*x-2*(3*x-4)-6 = 0
2-x = 0
(2-x)/(3*x-4) = 0
(2-x)/(3*x-4) = 0 // * 3*x-4
2-x = 0
2-x = 0 // - 2
-x = -2 // * -1
x = 2
x = 2
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