－3x＋4＜5x＋6
    16x－4( x－2)≤18＋6(-3x＋2)
    x ≤－2
    2x＋4≤3x－1
    4x＋5 ≤ x－3
    4－2x ≥ 5
    8 ≤ 4－2x
    3x＋5 ≥－1
    3x＋5＞2
    2 ( x－3 )＋5＜5x
    x-5/2<2x-1/3
    241.26*1000000≤22.4*2220*X*（1490-X/2）
    3146.44×10^6≤23.1×1800x×(1950-x/2)
    910.92×10^6≤23.1×1800x×(1950-x/2)
    1904.21×10^6≤23.1×1800x×(1950-x/2)
    4215.35×10^6≤23.1×1800x×(1950-x/2)
    4215.35×10^6≤13.8×1800x×(1950-x/2)
    3+X>5
    1944.84×〖10〗^6≤23.1×1200×x(1050-x/2)
    (a-6)^2＞0

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