(800-(300+x))*15≤9000
    (800-(300+x))*12≤9000
    (800-x)*12≤9000
    (800-x)*11≤9000
    (800-x)*13≤9000
    (800-x)*15≤9000
    (800-x)*10≤9000
    (800-x)*20≤9000
    (800-x)*30≤9000
    (800-x)*10≤1000
    (800-x)*20≤1000
    {800-(300+x)}*20≤6000
    {800-(300+x)}*10≤6000
    {800-(300+x)}*30≤6000
    (800-x)*30≤1000
    (70+x)/(79+x)>0.94
    3/4x＋1 ≤ 0
    x＋1/2＞2x－2
    －2x＋7＜3x－3
    －4x＋7 ≤－9

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