abs(x)>=x
    X>=X
    a＋b>4 ab<4
    10^x≥1
    e
    a(a-1)>384
    2x+1>1
    y*7÷6=175000
    y*7÷6=100000
    y*7÷6=10000
    y*7÷6=175546
    x*7÷6=175546
    x7÷6=175546
    x7/6=175546
    x7=10000
    4000-40n>11sqrt(n)
    -4√x +2x≥0
    60.5≤X+Y+Z≤61 20≤X≤200 20≤Y≤200 20≤Z≤200
    6/5=15
    a＋1300-55a/80≤8

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