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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 = 5/(4*x-1) // - 5/(4*x-1)
y-(5/(4*x-1)) = 0
y-5*(4*x-1)^-1 = 0
y-5/(4*x-1) = 0
(y*(4*x-1))/(4*x-1)-5/(4*x-1) = 0
y*(4*x-1)-5 = 0
4*x*y-y-5 = 0
(4*x*y-y-5)/(4*x-1) = 0
(4*x*y-y-5)/(4*x-1) = 0 // * 4*x-1
4*x*y-y-5 = 0
4*x*y-y-5 = 0 // + -y-5
4*x*y = -(-y-5) // : 4*y
x = (-(-y-5))/(4*y)
x = (y+5)/(4*y)
x = (y+5)/(4*y)
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