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2/x+2y+6/2x-y=4
=4x-2y+6x+12y=8x^2+12xy-8y^2
=10x+10y=8x^2+12xy-8y^2
=5x+5y=4x^2+6xy-4y^2
5/2x+4y+1/6x-3y=1
=30x-15y+2x+4y=12x^2+18xy-11y^2
=32x-11y=12x^2+18xy-11y^2
32x-11y=12x^2+18xy-11y^2
5x+5y=4x^2+6xy-4y^2
=37x-6y=16x^2+22xy-15y^2
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