X(6-x)<-3
    -15000+X-X*8%/4>=4500
    -15000+X-X*8%/4>4500
    (3/7)x+2>(5/6)x-3
    (3x/7)+2>(5x/6)-3
    x3/7+2>5x/6-3
    3/7x+2>5/6x-3
    5400+99x<540x+270x
    17(x+3)+30x<=200
    (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

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