Mathematics
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    3-8x<19-5x
    x+2>0
    2*k/5 - 1/5 <= k/2 + 1/2
    1-x>0
    3b+1>4b+4
    3b+1>4b+2
    (x+1)/2>(2x-1)/3
    5x-9<8
    10y<(500-15y)/10<20y
    10y<500-15y<20y
    10x∧2-800x+15000>0
    -10x+700>0
    300x+500(3x-10)>=18000
    (1-k)/6>=-1/3
    2<3X-7<8
    x-3(x-2)>4
    3x>9
    5-(2X+1)<3-6X
    5-(2X+1)<3-6X
    3(X-1)+13>5X-2(5-X)

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