x−7>−3
     3x−1≤5
     −4x>4
    x−3<5
    3x-2x+2≤4
    3/2-a＞0
    1＞a-1
    X＜20-X
    －41800+30000＋x－150000×12%÷4－x×10%/4≥3000
    41800－30000+x－150000×12%÷4－x×10%/4≥300
    -1x<2
    x≥x^x
    x＞x^x
    x＜x^x
    8x-1/x^2>0
    8x-1/x*x>0
    8x-1/x*x>1/8
    x*x*x>1/8
    -x-3＞0
    m+1>0 2m-2>0

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