разбиваешь на:
(x-6)(x+4)/(x-4)(x+4)
сокрощаем и получаем
x-6/x-4
..................................................................................................................................................................................................................................................................................................................................
разбиваешь на:
(x-6)(x+4)/(x-4)(x+4)
сокрощаем и получаем
x-6/x-4
..................................................................................................................................................................................................................................................................................................................................