8-2(x+2)>0 ((5x+1)/2)+1>((2x-1)/3)
    4-x>0 5x-3<0
    360m+540(50-m)<21000
    x^2+5＜6
    x∧2+5＜6
    -0.5+7/4a≥-2
    -0.5+7/4≥-2
    0.5-7/4≥-2
    0.5+7/4a≤4
    0.5-7/4a≥-2
    -0.5-7/4a≤4
    0.5-7/4x≥-2
    3x+1/2x+4>2
    5-1/2(x+4)>x
    2x-7<3(x-1)
    8/x>2x
     x/8>2x
    (x-61)/2>5
    (x-61)/2>=4
    (x-61)/2<3

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