2≤3x-7<8
    3+x>x/2+1
    (x+2)/2>(x+3)/3
    (x+4)/2<2
    5-2(x+1)<3-6x
    -3x-1>3
    -2.0639<(5.5-x)/(1.73/5)<2.0639
    2243+33-5(x-10)/4>5
    x^2-3.8＜0
    3.5x-2<=2x+1
    2x+1<3.5x-1
    x - 5 < （x - 12 ）/ 3
    x - 5 < x - 12 / 3
    x-5
    2x-2＞x
    3.816<11*6.93/x<21.92
    -1.96<(1000.25-x)/(sqrt(8)/sqrt(12))<1.96
    -2.2<(1000.25-x)/(2.63/sqrt(12))<2.2
    -1.96<(1000.25-x)/(2.63/sqrt(12))<1.96
    8x-1-9+3x<8x-3

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