x-1/2x+6 * x²-1/-3x-9
x²+6x+9/x²-x * 2x+6/4x²-8x+4
5/2* (x-1)
-3/2 * (x+1)
2x-6/x²-1 * 5x+5/4x-12
4x/x-1
2*(x+3)*(x-1)/x
x²+x/x²+1 * 4x²+4/x²-1
