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    (x-25+10)*0.6/((x-25+10)*0.6+(180-x+10)*1.3)=24.6%
    4*x^3+15*x^2+16*x+6=0
    -0.22x+106=18x+0.00044
    -7=-15624x
    -7=18*-868+x
    -0.22x+106=18x+2232
    3x^2-6x=1
    x^(x+1)=(x+1)^x
    x^2-x=1
    -75000+(44000/(1+x))+(44000/((1+x)^2))+(44000/((1+x)^3))=0
    4x^2+6x-14=0
    100=0.1×x/(1+x)
    100=0.1×x/(1000+x)
    0.1=100×x/(1000+x)
    100=100000×x/(1000+x)
    100000=100×x/(1000+x)
    5 = 100×1/(1+x)
    100=5×1/(1+x)
    x+xlnx=2
    x=100×10.1/(1000+10.1)

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