Mathematics
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    168-X-X×10%/4×3≥30
    (4a-1)^2-4*2a*2a>0
    250a+210(30-a)<5400
    x-3>2÷(4x-7)
    4x-3≥x-6
    (1-q^2023)/(1-q)≤1
    (-k)^2+(√3)^2+4k>0
    k^2+(√3)^2+4k>0
    10000/X+2900/(X+21.4)≤63.131313
    xlnx-2x-1.5<0
    C(x,2)<=245
    10000÷x+20000÷(x+50)<150
    10000÷x+20000÷(x+50)<150
    -4
    
20000*7.2≤20000*(1+4.2%)*(7.2-X)
    20000*7.26≤20000*(1+4.2%)*(7.26-X)
    20000*7.2≤20000*(1+4.2%)*(7.2-X)
    20000*7.2≤20000*4.2%*(7.2-X)
    10000÷x+30000÷(x+50)<150
    (2000×12-8000)x+(4500×3-5000)(8-x)≥100000

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