1.1×2955.03×106≤18.4×2000x(1450—x×0.5)
    2(x-2)≤2-x (x+2)/2>(x+3)/3
    2(x-2)≤2-x
    6x<=x+25
    x+3<=2x
    5x-3>2x-6
    4x+11<=7
    4x+11<=-7
    9x-4>7x+4
    4x-13<-1
    5x>2x+6
    2x+4>5x+13
    -3x-7<=-4
    3x-5<2x+7
    5x<=2x+9
    3x+4
    4x-6<=3x+5
    5x-9<8
    3x-2<7
    2x+3≤11

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