x/4-1+x+7x<=112
    x/4-1+2x+6x<=112
    3x+2x^2>x^3
    3x+x^3>2x^2
    x^3+2x^2>3x
    ((5*z)/4)*(80/(80-z))^60>7
     ( x / 4 ) - 1 + 2 * x + 2 * ( 14 * x / 6 )<=112
    [x/4]-1+2x+2[14x/6]<=
    [x/4]-3+6*[12x/14]+[12x/5]<=112
    [x/4]-2+4x+[14x/6]<=112
    X-3/X>2
    1200000+450x≤1000000+500x
    1200000+450x≤1000000×500x
    x－50-(100＋x)×1%≥10
    0x>1
    0.5 * ( ( 5 - k ) - sqrt ( ( k - 3 ) * ( k - 3 ) + 20 ) ) >0
    0.5((5-k)-sqrt((k-3)(k-3)+20)<3
    1 / 2 * ( ( 5 - k ) - sqrt ( ( k - 3 ) ^ 2 + 20 ) )>3
    1/2((5-k)-sqrt((k-3)^2+20)<3
    1/2((5-k)+sqrt((k-3)^2+10)>3

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