2240/x<1280/140+1.8;x>0
    2240/x<1280/140+1.8 x>0
    2240/x<1280/140+1.8 x>0
    2240/x<1280/140+1.8
    x<1280/140+1.8
    x<1280/138+1.9
    x<1280/128+1.9
    x<1280/128+3.5
    x<1280/8+3.5
    absx<4e
    absx
    absx≥0
    absx>0
    -8≤2x+1<11
    -1<3x≤8
    -1
    -1<-x≤8
    2<-x≤8
    2<-ex≤8
    2<-8x-2≤8

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