1/1+21/21+k/7<0.12
    4x+9-6(x-1)<3
    0≤4x+9-6(x-1)<3
    x^<4x
    4-（5x/8）>1-3x
    4-（5x）/8>1-3x
    4-（5-x）/8>1-3x
    X-3<1
    2X-5 ≤3（X-1）
    2x-7<3[x-1];5-1/2[x+4]≥x
    1.6x（30-2.5x）>=128
    （3-a）*(2a-3)>0
    2/3x+6=75%x
    67%x+6=75%x
    (-4/3)(2x+1)+x(x+1)<0
    (1/2)^x>1
    log(1/2,x)<0
    x>(100-x)/2
    1800x+1500(100-x)<161800
    1800x+1800(100-x)<161800

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