Mathematics
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    65a+54(40-a)≤2336 a≥(40-a)/2
    100a+120(80-a)≥8760
    100a+120(80-a)≤8800
    100a+120(80-a)≤8800
    160a+120(80-a)≤8800
    160a+120(80-a)≥8760
    sinx>0.5sqrt2
    lnx>2
    32000+6.2*a-168000-3.5*a>0
    32000+6.2*x-168000-3.5*x>0
    653*X+35760<3192*X
    x^2-5x+6<0
    x^2>1
    x+3(x-2)≤4
    x<=2/3(150-x); 100*x+120(150-x)<=17000
    2x(1.15+x)/(1+0.7x)/(2.15x+1.15)>1
    (x+1)/(x-2)>1
    5x≤2x+18
    100*120+(150-m)(300-120)≥31800
    8000+220(150-m)≥31800

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