x-2/x+2-x+2/x-2+16/x^2-4
=(x-2)^2/(x^2-4)-(x+2)^2/(x^2-4)+16/(x^2-4)
=((x-2)^2-(x+2)^2+16)/(x^2-4)
=((x-2-x-2)(x-2+x+2)+16)/(x^2-4)
=(-8x+16)/(x^2-4)
=-8(x-2)/(x-2)(x+2)
=-8/(x+2)
x-2/x+2-x+2/x-2+16/x^2-4
=(x-2)^2/(x^2-4)-(x+2)^2/(x^2-4)+16/(x^2-4)
=((x-2)^2-(x+2)^2+16)/(x^2-4)
=((x-2-x-2)(x-2+x+2)+16)/(x^2-4)
=(-8x+16)/(x^2-4)
=-8(x-2)/(x-2)(x+2)
=-8/(x+2)