This is how I would simplify:
(x-3+ y-3) / (x-2 – x-1 y-1 + y-2)
the answer is (x + y) / xy .
p.s '/' indicated fraction.
I tried it for almost 45 minutes but stuck at the last part.
I get this : [x+y (x2-xy-y2)] / [xy (x2+y2)]
This is my first post so please prove this forum worth staying !!!