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