x + y = 4
x - y = 2
----------------------------
2x = 6
x = 6/2
x = 3
3 + y = 4
y = 4 - 3
y = 1
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x + y = 4
x - y = 2
----------------------------
2x = 6
x = 6/2
x = 3
x + y = 4
3 + y = 4
y = 4 - 3
y = 1