Mathematics
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    800*(15-x)/2<=1000x
    1000x+800(15-x)/2+500(15-x)/2 <= 12000
    1000x+800(15-x)/2+500(15-x)/2<= 1200
    X-4X<-1-2
    1000x+800(15-x)+500(15-x)<=12000
    800(15-x)<=1000x
    1000x+800(15-x)+500(15-x)<=12000
    x/4-1<-x-3/3
    -4(7+4x)-3≥2-(6+2x)
    -(6-2x/5)≥3/2
    4-3x<3x+10 x+4>3x
    1.2*228.38*(2.24+t)<101.16*(0.75+t)+0.5*77.86t^2+0.5*317.8/9.66*t^3/3
    3x-0.5<1
    1.2*228.38*(2.24+t)>101.16*(0.75+t)+0.5*77.86t^2+0.5*317.8/9.66*t^3/3
    3(x-2)(x+1)+(2x-1)^2-7(x-3)(x+3) >= 28
    3(x-2)(x+1)+(2x-1)^2-7(x+3)(x-3)>=28
    x/2-(5x+7)/3≥1-(7x-2)/4
    3(x-2)(x-1)+(2x-1)^2-7(x+3)(x-3)>28
    3(x-2)(x-1)+(2x-1)^2-7(x+3)(x-3)>=28
    5x+1>3(x-1) ((1/2)x)-1<6-((2/3)x)

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