2x-4y=4 |: 2 2x-4y=8 x=2+2y 2 (2+2y) - 4y=8 4+4y-4y=8 0≠4
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2x-4y=4 |: 2
2x-4y=8
x=2+2y
2 (2+2y) - 4y=8
4+4y-4y=8
0≠4