x+2>0 x-1>0 x-5<0
    1.5x-7<=-0.5x+1
    3(x-1)<5x+2
    4＜m
    x-2≥0
    1+2x+3<3x
    x-4>3(x-2)
    3(x-1)<=2(2x-1)
    2x+3<5x+4
    1-0.5x>-1
    1+x＞3（x-1）
    2x+2≥0
    -2/4-1≤（a-1）/2
    -2x-3≤1
    k^2-55k+729<0
    k^3-56k^2+784k-729<0
    4
    8-2x>4
    5-2x>7
    2x+5>7

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