-x/3>-4/3
    5x/12>1/4
    3-2x≥2+x
    21(50-y)+32y<=1500
    2+[3(x-1)]/8>3-(x+1)/4
    -5/4【4/3（-3/2-12x)+4x]<=-(3x-1/4
    m<24-3/2m
    m<1/2m+4
    49×k^2+56×k-4>0
    10-4(x-3)≤2(x-1)
    2x-5>3x+4
    (x-9)/2+1≥(x+1)/3-1
    x（x－3）≤10
    2x+1<8
    13.11-0.2x<=20
    0.21+0.1x<=20
    0.21+0.1x>=0
    13.11-0.2x>=0
    13.11-0.2x>=20
    2x-6>0

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