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D( x )
x-3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
y = -6/(x-3) // + -6/(x-3)
y-(-6/(x-3)) = 0
6*(x-3)^-1+y = 0
6/(x-3)+y = 0
6/(x-3)+(y*(x-3))/(x-3) = 0
y*(x-3)+6 = 0
x*y-3*y+6 = 0
(x*y-3*y+6)/(x-3) = 0
(x*y-3*y+6)/(x-3) = 0 // * x-3
x*y-3*y+6 = 0
x*y-3*y+6 = 0 // - 6-3*y
x*y = -(6-3*y) // : y
x = (-(6-3*y))/y
x = -(y^-1*(6-3*y))
x = -(y^-1*(6-3*y))
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