Question 73719
<pre>
                 x^2-6x+9-y^2
                _____________
                   2x-6-2y

Factor the numerator and the denominator

                 (x^2-6x+9)-y^2
                _______________
                  2(x - 3 - y)


                 [(x - 3)(x - 3)]-y^2
                ______________________
                      2(x - 3 - y)

                    (x - 3)^2 - y^2
                ______________________
                      2(x - 3 - y)


                ((x - 3) - y)((x - 3) + y)
                ___________________________
                        2(x - 3 - y)

                {{{cross ((x - 3 - y))}}}{{{(x - 3 + y)}}}
                ____________________
                   {{{2 *cross ((x - 3 - y))}}}



                       x - 3 + y
                      ___________
                           2