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