2X+50－5X≥18
    16x-3x^3≥48
    4>5x
    [4(2-x)]/5>=1
    （2x+1）/3-x/2<=1
    （x-1）/3-（10x-1）/12>（2x-3）/4
    2-（y-2）/5<=y-（y-2）/2
    4-3x>2
    （6x-1）/4-2x>-2
    （2x-1）/3-（2x+5）/6>-2
    （5y）/4>=（y+2）/2
    1+2/5-2x<0
    （x-7）/2<（2-3x）/3
    （1-2x）/3>-2
    （m-2）/3+（m+3）/2 <5/6 m
    （m-2）/3+（m+3）/2<5/6
    （4x-5）/12<1
    （2x+1）/3>=0
    -67.144×n×n+0.968×n×n×n+1807.719444+79.3548×n≥0
    -43.833×n×n+1.128×n×n×n-21.650046-645.366×n≥0

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