rozwiąż nierówność:
2x+2y-x+1=y+2
x+y=1
x+2y+1=y+2 |-y
x+y+1=2 |-1
x+y=1 |*-1
-x-y=-1 /+
x+y=1 /+
0=0
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2x+2y-x+1=y+2
x+y=1
x+2y+1=y+2 |-y
x+y=1
x+y+1=2 |-1
x+y=1
x+y=1 |*-1
x+y=1
-x-y=-1 /+
x+y=1 /+
0=0