-x+3>-2
    5/3x-3<=-4/3[-5/4(6/5x-3)+9]+x
    5/3x-3<=-4/3[5/4(6/5x-3)+9]+x
    1/2x+1/3x≥10
    -[2(x+2)/7]-(x+3)/4>1
    -[2(x+1)/7]-(x+3)/4>1
    -3x>15
    （x-1)/3-(2-2x)/5>=x/15
    3/4x>=-1/2x-5
    60x+48*（60-x）≤3000
    3000x+(100-x)*800<=168000
    1.7x>=100-x
    x/sqrt(1-x^2)>0.732
    5(3-2x)-2(3x-2)>=6x
    -5/4[4/3(-3/2-12x)+4x]<=-(3x-1)/4
    -5/4[4/3(-3/2-12x)+4x]<=-(4x-1)/4
    （x+100)/240-x/280>0.6
    3x < 16x + 1
    -3x-1>3 2x+1>3
    -3x-1>3 2x+1>3

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