left XXX

left x left x y left x-2 right 2 left x-3 right 2 left x 2 +y 2 -1 right 3 x 2 y 3 left x-4 right 2 left x -3 cdot y 3 right -7 left x-2 right left x-3 right + ln left 2 right 3 left x 2 +y 2 -1 right 3 -x 2 y 3 0 left x-7 right 2 + left y+5 right 2 4 center