-0.3<(x-43.2)/43.2<0.3
    -0.3<(x-77.8)/77.8<0.3
    26700+x*(1-10%/4)≥50000
    -10x-ln x<=ln 0.02
    8x+(200-x)*10≥339
    2x＞66
    (x+2)/2＞(x+3)/3
    (1/2)(x+4)＜2
    (2x-1)^2-4(x^2-1)>0
    4x^2>0
    (x+2)/5＞(x-1)/4
    x+2/5＞x-1/4
    2-5x/6＜2x-3/2
    2(1-2x)＜3（2x-1）
    2-(1-2x)＜3（2x-1）
    2-0.5X≤X+3
    3（x-1） >5x+8
    (2x+3)/7>(-x+1)/3
    3（x-1）>5x+8
    -4082750+3000000-450000+a-a×10%/4≥300000

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