5/y-3
    2+5/y-3
    y-y-1/2>2+y-3
    y-2/y-1>2
    y-2/y-1
    y-2/y-1>2+5/y-3
    100+X/280-40-x/280≥0.6
    X+X*9%=51
    X+X*9%=252
    X+X*9%=1146
    X+X*9%=1708
    X+X*9%=647
    X+X*9%=764
    X+X*9%=470
    X+X*9%=640
    X+X*9%=233
    X+X*9%=716
    X+X*9%=220
    X+X*9%=591
    X+X*9%=195

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