-1/3x+1≤2/3x
    -2x＞0.5
    0.75x＞-0.25x-1/3
    0.75x＞-0.25x
    x^（7x-3）>=1
    x＞1
    x-1＜0 2-3*x＜0
    x-1＞0 2-3*x＞0
    x-1＞0
    (149.66/x)+(14.62/x^2)+(268.43/x^3)+(377.66/x^4)+(388.29/x^5) = 360.98
    x^2-700x+117600≦0
    W×18%＋（1－W）×13%＝16%
    17-5x<-10x+2
    5-5X>-x-3
    -8x<-3x-20
    1/4+2x<=8-1/2x
    10-x>-6x
    21-3x<6x-6
    29-x>4x+4
    7-5x>-7x+3

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