0.22×1×0.7×x÷100≥75
    0.22×1×0.7×x÷100≥75
    0.22×7×0.7×x÷2.9≥100
    0.22×1×0.65×x÷5.1≥75
    0.22×3×0.7×x÷21.1≥100
    0.22×3×0.7×x÷21.7≥100
    0.22×3×0.7×x÷21.7≥100
    -1/3x-1>2+7/6x
    50+0.4x<0.6x
    2x+9>3
    -(x-1)>3
    90*x+60*2*x<=14700
    12-4*(3x-1)=<2*(2x-16)
    （X-30）【600-（x-50)20】≥8000
    （X-30）【600-（x-50)20】≥8000
    ln√x<1
    1289793.43≤(2164463.05+1289793.43)*0.2
    -4114150+3000000-450000＋X－X×10%/4≥300000
    100+0.9×（a-100）≤2000
    5x＋3＋20＋7≤150

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