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x-y=1
3x+y=5
-------------
4x=6
-----------
x=1,5
----------
1,5-y=1
y=0,5
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x-y=1
3x+y=5
-------------
4x=6
x-y=1
-----------
x=1,5
x-y=1
----------
x=1,5
1,5-y=1
----------
x=1,5
y=0,5