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