3＜11.7×（8-x)÷26.6÷3x＜6
    3＜11.7×（8-x)÷26.6x＜6
    11.7×（8-x)÷26.6x＜6
    7-3/2x>=1/2-1
    5x+2>3x-1
    abs(4x-5)<-2
    abs(4x-5)<=-2
    -3-2abs(4x-5)>1
    -3-4abs(-2x-5)>=-7
    6-3abs(1-4x)<-3
    -2-3abs(-3x-5)>=-5
    -2+3abs(5-x)<=4
    -3-2abs(4x-5)>=1
    abs(-10+x)>=8
    30
    x/3<3-X-2/2
    100*(1-4%) ≤100（1+x）*0.8≤100（1+4%）
    4-x>3
    （x+2）（x-3）大于等于0
    -2-3abs(4-2x)>=-8

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