4x^3-64x≥9
    4x^3-64x≥0
    x^5+4x^3-64x≥0
    x^5+4x^3-4x≥0
    x^5+4x^3-2x≥0
    x^5+4x^3-x≥0
    5x^2+4x>0
    （2x-1/5）-(x-2/3)≥1
    4x-4≤3x+2
    800x<=1000(15-2x)
    1000(15-2x)+(800+500)x<=12000
    6((2/3)x+1)>=2x-5
    7(x-1) <4x+3
    5(x-2)-1<=4(1+x)
    x+1<=2
    4x+2/3小于x/5-8+2
    40+x≥4/3（20+x）
    5+2(x-1)>-1 ((6-5x)/2)>-x-3
    5(x-1)<-x+1 ((x+1)/3)-((3x+1)/2)<1
    3x>4x-6 ((x-2)/2)>((x+1)/5)

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