3x＋1＞1
    0.1x＋0.3≤10
    2x＋3≥3x－1
    1066/7 - (8*K)/35>0
    - (8*K)/35 - 2/35>0
    ((4*K + 1)*(2*K + 1733))/(35*((8*K)/35 + 2/35))>0
    ( 2 * K * ( 4 * K - 3465 ) ) / ( 35 * ( ( 8 * K ) / 35 - 198 ) ) >0
    (2*K*(4*K - 3465))/(35*((8*K)/35 - 198))>0
    198 - (8*K)/35>0
    x+5x+25x+250x+2500x≤5600 x=
    18*（31-x）＋25*x＜750
    18（31-x）＋25x＜750
    558x－18x＋25x＜750
    18（31－x）＋25x＜750
    abs(x-2)≤3
    1/2^n＜1/60
    x+√4+x²＞0
    4x^2-3x+2<0
    x/(x+1)
    -x-1＜-2/x

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