(x+2.5)/ln((40.5+2.5)/(40.5-X)) = 47.449
    (x+2.5)/ln((40.5+2.5)/(40.5-X)) = 40.349
    (x+2.5)/ln((40.5+2.5)/(40.5-X)) = 36.447
    t^2+2t—2=0
    3x^4+2x^3+2x+3 = 0
    3x^4+2x^3+2x+3=0
    168.84+3x=3*103.8
    (x+2.5)/ln((40.5+2.5)/(40.5-X))=32.305
    168.84+2x=3*103.8
    0.031x+ln（40.5-x）=3.684
    -0.06318*100*exp(-0.06318*x)+2*((100*0.06318*0.6412)/(0.0244-0.06318))*(-0.06318*exp(-0.06318*x)+0.0244*exp(-0.0244*x))
    （184.3+3.1x）=3*120.8
    -0.06866*100*exp(-0.06866*x)+2*((100*0.06866*0.6678)/(0.02295-0.06866))*(-0.06866*exp(-0.06866*x)+0.02295*exp(-0.02295*x))
    （184.3+3.1x）=3*103.8
    -0.07153*100*exp(-0.07153*x)+2*((100*0.07153*0.6615)/(0.02018-0.07153))*(-0.07153*exp(-0.07153*x)+0.02018*exp(-0.02018*x))
    12X=10X+30000
    2x-1/3-1≤5x-1/2
    -0.08165*100*exp(-0.08165*x)+2*((100*0.08165*0.7049)/(0.02261-0.08165))*(-0.08165*exp(-0.08165*x)+0.02261*exp(-0.02261*x))
    1.2X=X+3000
    1.2*X=X+3000

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