8299/x+x<8299/(x+1)+x+1
    1/x-2＜1
    2x＜x＋4
    6－2x≥0
    i*2.5-i/5*6>100
    (x+3)/4>(2-3*x)/5
    (4-x)/3>(x+3)/4
    x+5<2 x-5>100
    x＋2＜3x
    x＋2＞3x
    2x-3＜-5
    x * ( x + 1 ) <2000000000
    x*(x+1)<1000000
    x*(x+1)<=2000000000
    x*(x+1)/2<1000000000
    x*(x+1)/2<=1000000000
    x*(x+1)<1010
    x * (x + 1) / 2 <= 1000000000
    x < 3
    n(n+1)/2<=1000000000

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