(x-2)/2>x/4
    2x-(x-1)/2<1
     (2x-1)/3≤(3x+1)/2
     x + 30 - 1.5 * x <24
    x/20+30-1.5*x<24
    5-m>0
    200*x+300*((540-12*x)/15)<10600
    K>0 (K-1)/K>0 (K-1-K^2)/(K-1)>0
    0>25x^2+10x-15
    -48x>-20x^2-28
    0>12x^2+40x+32
    -12x^2>34x+24
    0＜6x-141＜10
    -3<3b/(2-2x)<-2
    3x/2-2x>-3
    0＜141-6x＜10
    0＜x＜9
    -√3
    e(log(2,3))x＞4
    elog(2,3)x＞4

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