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2x - y = 8. (x2)
3x +2y = 12
4x - 2y = 16
------------------ +
7x = 28
x = 4
4x - 2y = 16
4(4) -2y = 16
16 -2y = 16
-2y = 16 -16
-2y = 0
y = 0