Mathematics
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    -8≤2x+1<11
    -1<3x≤8
    -1
    
-1<-x≤8
    2<-x≤8
    2<-ex≤8
    2<-8x-2≤8
    2
    
36-2x≦19
    38-2x≦19
    38-20≦19
    x^3+x+2<0
    24k>=-18k^2-8>=51k
     (3x-2)/x>0
    4440×a≤3000×a+150×(a×(a-1))/2
    (3a+1)/2 > a
    x^3+3*x+9>=5x^2
    36×(x+1)^2-4×(3×x^2+2×x+1)×(9-2x^2)>0
    -1<=-3/a<=2
    4875000/((400+x)^2)<=1.7

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