4x>2x-6 (x-1)/3≤(x+1)/9
    2x-4≤(1+x)/2 3(2-x)≤x+2
    1-2x<21
    1-2(x-1)≤7 ((1+2x)/3)+1>x
    x-1≥0 x-1<3x/4
    5x-1>3x-4 (-1/3)x≤2/3-x
    1+x>-2 (2x-1)/3≤1
    ((x-4)/2)+3≥x 1-3(x-1)<6-x
    ((x-3)/2)+3≥x+1 1+x<8+3(x-1)
    3x-(x-2)≥6 x+1>(4x-1)/3
    3(x-1)<6x (x+1)/2≥2x
    3x+3>5(x-1) (4/3)x-2≥(6-2x)/3
    -1874.179+1021.159n+n^2/3×(750.781+19.119n)×(2252.343+38.238n)/(1501.562+38.238n)-0.4×n^2(248.477+4.766n)×(754.431+9.531n)/(469.954+9.531n)≥0
    x+3≥2x-1 3x-5≥1
    x+5>3 x+6>4x-3
    2x-1>x+1 x+8>4x-1
    a-√a^2-3≤3/4
    2a^2-3+2a√a^2-3≥9/4
    x+5＜4x-1
    2x-1≥x+2

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