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I cwiartka x≥0 i y≥0
x+x=y+y
y=x
II cwiartka
x<0 i y≥0
-x+x=2y
y=0
III cwiartka
x<0 i y<0
-x+x=-y+y
0=0
IV cwiartka
x≥0, y<0
2x=0
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