13.11-0.3x>0.21
    13.11-0.3x>=0.21
    2x
    20.11-0.28x>=0.27
    13.11-0.3x<=20
    14+0.2x<=25
    3x+4<2
    20.11-0.28x<=20
    78k^2－60k＋17≥0
    78k2－60k＋17≥0
    （16-10）×200×（1-20%）+200×（x－30）≥3200×90%
    (-1-m)^2-1≤(4-m)^2-1
    22+0.25x<=25
    4/x＞x+3
    x+3＜4/x
    3x-4<=6x-2 (2x+1)/3-1<(x-1)/2
    2m+7>0 4m-3>0
    2x-4(x-5)>=8 (2x-1)/2>2-x 2x+3<=x+7 (2x+5)/3-1>2-x
    1-a>0 2a+6<0
    2x+9>6x+1

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