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D( x )
x-1 = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
(3*x)/(x-1) = 3/4 // - 3/4
(3*x)/(x-1)-(3/4) = 0
(3*x)/(x-1)-3/4 = 0
(3*4*x)/(4*(x-1))+(-3*(x-1))/(4*(x-1)) = 0
3*4*x-3*(x-1) = 0
9*x+3 = 0
(9*x+3)/(4*(x-1)) = 0
(9*x+3)/(4*(x-1)) = 0 // * 4*(x-1)
9*x+3 = 0
9*x+3 = 0 // - 3
9*x = -3 // : 9
x = -3/9
x = -1/3
x = -1/3
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