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