(x-2)(y-3)=1 xy-3x-2y+6=1 x=-1-y
x-2=y-3 x-y=-1 y(-1-y)-3(-1-y)-2y+5=0
-y-y2+4+3y-2y+5
y2=9
y=3 или y=-3
x=-1-3 x=-1+3
X=-4 X=2
(x-2)(y-3)=1 xy-3x-2y+6=1 x=-1-y
x-2=y-3 x-y=-1 y(-1-y)-3(-1-y)-2y+5=0
-y-y2+4+3y-2y+5
y2=9
y=3 или y=-3
x=-1-3 x=-1+3
X=-4 X=2