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4x = 16
3x-y=12
x = 4/16
3*4/16-y=12
x = 4/16
3/4 - y = 12
x = 4/16
-y = 12 - 3/4
x = 4/16
-y = 11 1/4
x = 4/16
y = - 11 1/4
x = 1/4