(2+x)/2>=(2x-1)/3-2
    (x-3)/2>=(2x-5)/3
    (x+0.5)^2+2*x≥0
    x+2<6
    (4a+1)/6<-2
    (4a+1)/6>0
    (y+1)/6-(2y-5)/4>=1
    (5x+1)/6-2>(x-5)/4
    (2x-1)/3<=(3x-4)/6
    (x-3)/2<(2x-5)/3
    10-4(x-4)<=2(x-1)
    10(20-x)>90
    4.8x<=6
    4.8/x<=6
    (5/24)x<=6
    abs(k+5)≤sqrt(k^2+1)
    (2-0.5^(x-1))/(2-0.5^(x-2))>2
    (2-0.5^(x-1))/(2-0.5^(x-2))>1
    t+(4/t)≤5
    t+4/t≤5

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