(x-1)/6>(x+5)/3-(3x-2)/4
    (x-1)/6>(x+5)/3>(3x-2)/4
    300-36<=8x
    16x<=72
    240+4x<=600
    140+3y+200>=1000
    (2x-8+3)/2<=(2x+6-4)/3
    (2x-8+3)/2<=(2x+6-4)/2
    5x－5＞5
    x＋4x≤400×70%
    x^2-100x-7500 <0
    x^2-100x-7500>0
    (2x-7)/(x+3)>2
    2x-7/x+3>2
    100+x/280-40 - x/280≥0.6
    10x-5(20-x)>120
    3x>6
    4x+18-6(x-1)>0
    4x+18-6(x-1)<5
    x^3-2x+1<0

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