Mathematics
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    20000*(1+4.2%)*7.1≥20000*(7.1-X)
    20000*(1+4.2%)*7.1≥20000*(7.1-X)
    14x+8.6(20-x)>200
    24x+8.6(20-x)>200
    24x+18.6(20-x)>200
    24x+18.6(20-x)>200
    X>=0
    lnx/x>1/e
    lnx>1/ex
    lnx>1/e x
    lnx>1/e*x
    lnx>(1/e)*x
    lnx<1
    (x^9+x^5-45)/(9+x^7) >(x^-5)+7
    (x^6+x^5-45)/(√(9+x^2))>√(x^-5)+7
    0<2x^2-2x<24
    2x^2-2x<24
    ex<sinx
    ex<sinx
    ex<sinx

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