1－3*(x－1)＜8－x
    x+3≥2x+2
    3y-9小于等于2y+3
    2X+2小于等于7-2X
    －2x－16＞－36
    [(n-1)^2*(255.033+32.988n)]/6+843.949+161.577n≥847.673+220.712n+[n^2*(178.545+11.279n)]/5
    [n^2*(405.768+32.988n)]/6+426.787n+1915.68≥2287.26+574.26n+[n^2*(252.801+11.279n)]/5
    -13.453×n×n-0.9684×n×n×n+7984.74276-120.994×n≥0
    -15.13844×n×n-1.4225×n×n×n+8174.70008+721.84×n≥0
    1.128×n×n×n-40.93868×n×n-699.622-671.86632×n≥0
     ( 5 * x + 1 ) / 3 - ( 2 * x - 2 ) / 7 > ( 3 - 7 * x ) / 21
    -20.945n2+1.59n3+1664.5179-1151.86n≥0
    （2x-1）/6>=1-（2x+1）/2
    （x-3）/3<=1-x/6
    2（3y-1）+3（2y+9）<5y-3
    3x+4>2x
    -20.945×n×n+1.59×n×n×n+1664.5179-1151.86×n≥0
    （5x+1）/3-（2x-2）/7>（3-7x）/21
    1-（6x-3）/8<=2+（x+2）/4
    3x-2（5-x）<=4（7x-1）+1

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