(-7+2a)/3>-(16a)/3
    (4+5m)/6>=7/8-(1-m)/3
    200（1-15%）*40+200a-8000≥3000*70%
    3a-1>2
    20x+25x+20*70%（150-x）+15（200-x）-4800≥2348
    2x-1>4x+5
    5-2a<1
    1-2x>x-2
    6x-3<9-3x
    1-(x-5)/4≥x/2
    1-x-5/4≥x/2
    x+4<2(x+1)
    x-4<2(x+1)
    4-x-5≥2x
    x-3<2(x-1) 2+(x/3)>1-((x-2)/2)
    2+3/2y>=1
    (-19-a)/(-6-a)<=4
    0<=(-19-a)/(-6-a)
    (-3-5a)/2<0
    120x+80(80-x)≤9820

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