0<4/x<2
    x<1080/x<720/144
    0<8/x<4
    8/x<4
    1080/x≤5
    10/x≤5
    10/x≤20
    2/x≤7
    (10x)/(5x+2)>8
    10x/5x+2>8
    10x/5x+2>1
    4.8<1080/x<5
    1080/4>x>1080/5
    x>1080/5
    1080/x>720/144
    1080/x<720/144
    4<1080/x<720/144
    0<1080/x<720/144
    0
    x<720/144

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