3/7/4/5/a=5,b=-4/1/4/3/5/1/a=2,b=1,x=4,y=-1/3a+2b=1{-a-b=1,a=3,b=-4,-2/2/2/4/5/2/3/5/5/3/2/x=2,y=-3/4/5/4/2/3/5/3/x=3,y=5/2/5/1/5/3/4/2/2/5
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