（1+ r）^12=10%
    log2(x)=(x)^(1/2x)
     22000+x/1.05*0.015+x/1.05*0.015*0.07*0.5+x/1.05*1.035*0.02+x/1.05*1.035*0.005 = x
    6^x-5^x=11
    6^x+5^x=11
     22000+x/1.05*0.015*1.035+x/1.05*0.02+x/1.05*0.005 = x
    22000+x/1.05*0.015*1.035+x/1.05*0.2+x/1.05*0.005 = x
    22000+x/1.05*0.015*1.07+x/1.05*0.2+x/1.05*0.005=x
    22000+0.02x+0.005x=x
    22000+0.02x+00005x=x
    0.02x+00005x=x
    293.6x+7.77xlnx-133284.54=0
    2x^2+13x-20=0
    162x＾2－300x＋128＝0
    2x^2-9x-34
    5x^2+4x=15
    x+2=0
    egg=62500e
    x²-5x+2= 0
    21679.45=[(220+220)*63-x]*0.85+8*63

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