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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 = (2*x-9)/(x-3) // - (2*x-9)/(x-3)
y-((2*x-9)/(x-3)) = 0
(-1*(2*x-9))/(x-3)+y = 0
(-1*(2*x-9))/(x-3)+(y*(x-3))/(x-3) = 0
y*(x-3)-1*(2*x-9) = 0
x*y-2*x-3*y+9 = 0
(x*y-2*x-3*y+9)/(x-3) = 0
(x*y-2*x-3*y+9)/(x-3) = 0 // * x-3
x*y-2*x-3*y+9 = 0
x*y-3*y+9 = 0 // - 9-3*y
x*y = -(9-3*y) // : y
x = (-(9-3*y))/y
x = -(y^-1*(9-3*y))
x = -(y^-1*(9-3*y))
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