(117*7+39*x)/(117*39)<26%
    -30x^2+3300x-84000≥6480
    1.5*x+0.9*((6000-80*x)/40)<120
    (240000-x)/12000>10
    (240000-x)/12000<10
    （240000-15000*x）/12000<10
    （1+x）（20-2x）≥60
    （1+x）^7（1+2.5x）>1
     -4082750 + 3000000 + x - x * 10 % / 4 - 450000 ≥300000
    x(3x+5)>0
    (x+2)/5≤(x-1)/3+1
    7(x+3)-5(x-2)≥3x
    2x-3(x-1)>2
    (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

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