7x^2+10x-11x-6>0
    64＞35x+30＜32x＜3
    64＞32x＜3
    23＜3x+63＞30
    32x＞64 x＜3
    231x+134x＞291
    2-n＞n-2
    1-x/x+1>0
    x^2-3x-4≤0
    2x^2-x-6<0
    X-550-(1000*6%/12+1500*8%/12+X*6%/12)≥50
    X-550-(1000*6%/12+1500*8%/12+X*6%/12)≥50
    n^2-24n+50>0
    n^2-12n+50>0
    n^2-2n+61>0
    3^(1/3)<(n+1)^(1/n)
    n^(n-1)<(n-1)^n
    n^(n-2)<(n-1)^(n-1)
    (40000-3000*x)/4000*600+800*x<9150
    600*(40000-3000*x)/4000+800*x <9150

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