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3x+y=2k-4 (2) 2y-x=2 (1) (1)+3*(2) 3x+y+6y-3x=2k-4+6 7y=2k+2 y=(2k+2)/7 x=2y-2=2(k+2)/7-2 y>0,(2k+2)/7>0,2k+2>0,k>-1 x
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