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D( x )
x-4 = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:4) U (4:+oo)
(2*x-3)/(x-4) = 2/3 // - 2/3
(2*x-3)/(x-4)-(2/3) = 0
(2*x-3)/(x-4)-2/3 = 0
(3*(2*x-3))/(3*(x-4))+(-2*(x-4))/(3*(x-4)) = 0
3*(2*x-3)-2*(x-4) = 0
4*x-1 = 0
(4*x-1)/(3*(x-4)) = 0
(4*x-1)/(3*(x-4)) = 0 // * 3*(x-4)
4*x-1 = 0
4*x-1 = 0 // + 1
4*x = 1 // : 4
x = 1/4
x = 1/4
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