5x+10(80-x)≥720
    15x+35(80-x)≤2500
    4m^2－8m＞0
    (2x-3)/2>=(x+2)/3
    3x-5<4 -3x+5<4
    -x-1>=-1-x
    0.5x+1<3
    (-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)

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