x+1/6-3x<0
    (10400-150x)/100/X+8<25
    (10400-150x)/100/X+3<30
    0<(10400-150x)/100/X+3<30
    0<(10400-150x)/100X+3<30
    (10400-150x)/100X+3<30
    2<2a-√（4a*a-4)<4
    0<2a-√（4a*a-4)<2
    0<2a-√4a*a-4<2
    0<2a<2
    -(x+1÷2)＜3
    2≤|3x-2<|5
    2≤3x-2<5
    sqrt((5-2x)＞x-1
    sqrt((5-2x)＞x-1
    (x-1)(x+2)>=(x-2)(2x+1)
    (x+2)(x-3)<6
    x^2+x-6>0
    x^2-5
    x^2>3x

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