Mathematics
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    (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
    x+5<18
    x+2<18
    1/3x+2 ≤ 4
    x-1<-( x-4 ) 2x<5 -2x<-5 10>4x
    -15/4<x ≤ 6
    2x+9<7x-1
    -( x+4 )+15 ≥ 3x-9

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