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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)
y = (3*x-2)/(4*x-1) // - (3*x-2)/(4*x-1)
y-((3*x-2)/(4*x-1)) = 0
(-1*(3*x-2))/(4*x-1)+y = 0
(-1*(3*x-2))/(4*x-1)+(y*(4*x-1))/(4*x-1) = 0
y*(4*x-1)-1*(3*x-2) = 0
4*x*y-3*x-y+2 = 0
(4*x*y-3*x-y+2)/(4*x-1) = 0
(4*x*y-3*x-y+2)/(4*x-1) = 0 // * 4*x-1
4*x*y-3*x-y+2 = 0
4*x*y-y+2 = 0 // - 2-y
4*x*y = -(2-y) // : 4*y
x = (-(2-y))/(4*y)
x = (y-2)/(4*y)
x = (y-2)/(4*y)
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