x+y=-40
+ x-y=-160
_____________
2x= -200 /:2
x=-100
-100+y=-40 / +100
y=60
te liczby to y=60 i x -100
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x+y=-40
+ x-y=-160
_____________
2x= -200 /:2
x=-100
x+y=-40
-100+y=-40 / +100
y=60
te liczby to y=60 i x -100