((16+x)/220+1)/(x/220+1)<1.01
    ((16+x)/220+1)/(x/220+1) < 1.04
    ((16+x)/220+1)/(x/220+1)>1.04
    ((16+x)/220+1)/(x/220+1)>1.01
    ((16+x)/220+1 )/(x/220+1) > 1.01
    ((16 x)/220+1 )/(x/220+1) > 1.01
    ((16 x)/220 1 )/(x/220 1) > 1.04
    ((16+x）/220 +1 )/(x/220+1) > 1.04
    6y＋5(2y＋60)≤2100
    x/3>(x+1)/4
    2x-4<3(x-1)
    -12x∧2+4x+1＞0
    -12x∧2+4x+2＞0
    -12x∧2+4x+4＞0
    -12x∧2+4x+5＞0
    32x^2-40x+9<0
    1/x-1+1>1/2
    4/7≤x×x-2x+4≤7
    (1000*1.03^(x-1))1.03＜2*1.05^(x-1)
    (1000*1.03^x)1.03＜2*1.05^(x-1)

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