x + x + 2 + y = 21
(2x + y = 19) ײ
4x + 2y = 38
x + 2y = 23
______________
3y = 15
x = 5
2x + y - x + y = 23
5 + 2y = 23
2y = 18
x = 9
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x + x + 2 + y = 21
(2x + y = 19) ײ
4x + 2y = 38
x + 2y = 23
______________
3y = 15
x = 5
2x + y - x + y = 23
x + 2y = 23
5 + 2y = 23
2y = 18
x = 9