x + y = 10
x - y = 4
---------------
2x = 14 → x = 14/2 → x = 7
7 + y = 10
y = 10 - 7
y = 3
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x + y = 10
x - y = 4
---------------
2x = 14 → x = 14/2 → x = 7
7 + y = 10
y = 10 - 7
y = 3