5x-9<8
    10y<(500-15y)/10<20y
    10y<500-15y<20y
    10x∧2－800x＋15000＞0
    -10x＋700＞0
    300x+500(3x-10)>=18000
    (1-k)/6>=-1/3
    2<3X-7<8
    x-3（x-2）>4
    3x>9
    5-(2X+1)<3-6X
    5-(2X+1)<3-6X
    3(X-1)+13>5X-2(5-X)
    3x乘以2.5（2600－x）小于等于700
    3x＋2.5（2600－x）小于等于700
    -x-2>x/3
    2/3x+5>1-x
    3x+2<4x
    4x+（10-x）2.5大于等于30
    x-5>1+2x

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