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D( x )
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0 // + 1
3*x = 1 // : 3
x = 1/3
x in (-oo:1/3) U (1/3:+oo)
y = 5/(3*x-1) // - 5/(3*x-1)
y-(5/(3*x-1)) = 0
y-5*(3*x-1)^-1 = 0
y-5/(3*x-1) = 0
(y*(3*x-1))/(3*x-1)-5/(3*x-1) = 0
y*(3*x-1)-5 = 0
3*x*y-y-5 = 0
(3*x*y-y-5)/(3*x-1) = 0
(3*x*y-y-5)/(3*x-1) = 0 // * 3*x-1
3*x*y-y-5 = 0
3*x*y-y-5 = 0 // + -y-5
3*x*y = -(-y-5) // : 3*y
x = (-(-y-5))/(3*y)
x = (y+5)/(3*y)
x = (y+5)/(3*y)
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