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x - y = 0 +
2x = 6
x = 3
y = ? => x + y = 6 => 3 + y = 6 => y = 3
3x + 2y = 6
2x - y = 5/10 => 20x - 10y = 5 => 4x - 2y = 1
3x + 2y = 6
4x - 2y = 1 +
7x = 7
x = 1
3x + 2y = 6 =>> 3.1 + 2y = 6 =>> 3 + 2y = 6 =>> 2y = 3 =>> y = 3/2