64564+546576
    abs(x+6)-abs(x-3)>2
    abs(x)>2
    abs(2)>2
    (5/2+5y)^2
    x^2-1<=-x-1
    x^2-1<=x+1
    (x-4)(x-5)>0
    x^2+15/8x-15/8<0
    9a^2-16a+4≥0
    5x<=20/x
    2-4x>3(3x-1)
    6>(x+1)^2>2
    (x+1)^2>2
    (x-3)(x-1)=0
    x-2>0
    x^2-2x-6>9
    (x-1)/(x+3)<9
    3x+10(900-x)≤6200
    1/a>0

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