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3/4x +6y =-1 /*4
6x + 24y = 16
3x +24y =-4 /*(-1)
6x +24y =16
-3x -24y =4
3x = 20 /:3
x=20/3
x=6 2/3
-3*(20/3)-24y=4
-20-24y=4
-24y=24 /:(-24)
y=-1
odp.
x=6 2/3
y=-1