Mathematics
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    -500000+13k≥0
    1000a+1800(20-a)≤26400 500a+900(20-a)≥12000
    12a+10(8-a)≤89 200a+160(8-a)≥1380
    3(x+2)>4x+2 1/2x≥1/3(x-1)
    1/3x-5≥1/6(4x+1)-7/2
    6x-2>3x-4 1/3(2x+1)-1/2x<1
    5(x-2)+8≤6(x-1)+7
    -2x+15<3
    a+2≥3a-2
    1≤-2x+13<3
    5(25x+12)+2≥37
    5(5x+2)+2≥37
    1/3(x+1)>x-1 2(x+3)-4≥0
    1/3(x+1)>x-1
    (2x+1)^2-4x^2>0
    1/sqrt(ln(1+x))≤2
    sqrt(ln(1+x))^3≥8
    sqrt(ln(1+x))≥2
    1/(1-ln(1+x))≤-1
    1/(1-ln(1+x))<0

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