-3x＋4＜5x＋6
    16x－4(3x－2)≤18＋6 (-3x＋2)
    16x－4(x－2)≤18＋6 (-3x＋2)
    5－5/3x＞7－x
    5－x＞7－x
    x＋7 ≥－2x＋1
    x--5/6>-6/2x+13
    0.2x-0.3≤0.5x+0.7
    5*n^2+n-500＜0
    abs(x^2+2*x+2)<2
    -48+x-x*0.02≥50
    x*x-156x-12800>0
    (x+100)*(1-128/x)>128
    a*a-156*a-12800>0
    (a+100)(a-128)>128a
    (a+100)(1-128/a)>128
    128<(x+100)(1-128/x)
    (1-128/x)*128<(x+100)
    (1-128/x)*128
    (1-128/x)/128

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