So: x-y-2=0.

x-y=2 ( 1)

The absolute value must be positive.

So: x+y+ 1=0.

x+y=- 1 (2)

Substitute 1 and 2 into (x-y)? +2(x+y)？ -(x+y)？

=2? -2+ 1

=8-2+ 1

=7