300+10(x-7)<40x
    3−2x≤5/7-2/14x
    2000÷2*(10-7)+2000÷2*(y-7)>2000*20%*7
    2000÷2*(10-7)+2000÷2*(x-7)>2000
    -（x+3）(x-2)>0
    （x+30000）×4.8%＜35940-x×0.2%
    3x-3＜8x-10
    2/x-1＜3/4x-5
    2x-2＜6
    -2/x+1＜3
    (800-(300+x))*30≤9000
    (800-(300+x))*22≤9000
    (800-(300+x))*20≤9000
    (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

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