22＜11x
    （2x+1）/（1-x）＜5
    -1＜（9a+13）/5≤8
    -1＜9a+13/5≤8
    -15≤4x+1≤21
    5(x-2)+8<6(x-1)+7
    80x+50(50-x)≤3000
    210x+90*(18-x)≥2100
    900n-100n^2<2000(1.2^n-1)
    1/x+x>20 1/x+x<40
    2x>20
    2x> 20
    9*(t^2)-34*t+25≥0
    570*x/(935641+x)*5-x*0.003 >0.1
    570*x/(935640+x)*5-x*0.002 > 0.1
    570*x/(935640+x)*5-x*0.003 > 0.1
    7+2k/13>0
    x+1<999999
    40000*x/(126584759+40000)*4.69-40000*0.003>0.1
    40000*x/(126584759+40000)*4.69-40000*0.003>0

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