(3x+1)/2>3x-2 2x-3(x+2)<=-5
    a-1<0 -a-1>=0
    (x+1)/3
    x-2<1 4x+5>x+2
    3x-1>=x+1 x+4<4x-2
    3x<=2x+1 2x+5>=-1
    2x-2<=0
    20*a+30*(800-a)<19320
    800-a>2/3*a
    80x+60(20-x)≤1440
    3x-7小于等于7
    x²-x-1＞0
    x*（2x+3）<9
    x/2<1
    2/x<1
    x/2<1
    80x+60(20-x)≤1440
    2x+1>5x-5
    28≤0.5x+1.5(30-x)≤30
    28≤0.5x+1.5(30-x)≤30

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