x/2+x/3≤5
    4-3x>=2x-6
    3x-4>=4+2(x-2)
    -1.5x+3<0
    3x+2<2x+3
    180x＋240(20-x)≤4320
    20-x≥x
    4(x＋1)≤7x＋10
    x-5<(x-7)/3
    x-5
    5x+1>3(3x-1) 0.5x-1≤7-1.5x
    x-5
    (x-1)/5 <(2x+5)/3
    3x+4 ≤x+6
    x+7/3≤x+3
    2X-140＝2628900
    （2x+1）（3x+2）大于12
    5*(2*x-1)>4*(3*x-2) (x-1)/4<(1-2*x)/5
    abs(2*x-3)≥x+1
    200X+170(30-X)<=5700

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