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3x - y = 3
-------------------- -
3y = 9
y = 3
3x - y = 3
3x - 3 = 3
3x = 6
x = 2
3x - y = 3 -
3y = 9
y = 3
3x + 2y = 12
3x + 6 = 12
3x = 6
x = 2
x = 2
y = 3