Mathematics
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    -x×2-7x+8>0
    (-x×2)-7x+8>0
    -(x×2)-7x+8>0
    3x-x<0
    x+3/2 - 5x-1/6 x≦5
    x/2 -3x>10
    x/188+10>x/180
    X/188+10>x/180+8
    7-3x>0
    (2x+1)/3 - (3x+2)/2>1
    -9<-5/3*x<-2
    -(1/2)x≤0
    90<11y-2<100
    (1/5)x≥(1/5)
    -3<6-5/3x
    -4x<14
    -4x<19
    7x-7<5x
    X+2≤1
    11-3y<2

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