Mathematics
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    x+1>4x+5
    3x>4x-1
    5(3-2x)>0
    20x-19>18x-9
    x/5-3<=6/5x+2
    x+4≥3x
    4-3x≤3x-2
    5x-7<3x
    4x-15<2x-3
    {x≤2+1/3 {x>-1
    2×(r-20)×(r+1)≥-3
    x≤2+1/3 x>-1
    2×(r-21)×r≤-3
    x>-4 x>-2.5
    5y-4
    
3x+2<=0
    5-3x>=2
    2(1-x)>3(x-1)
    3x+1<9-x
    0.8[0.8x+0.3(400-x)]+0.3*[0.7(400-x)+0.2x]>200

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