（26.493+x）×2.85＝26.493+70.278-x
    （26.493+x）×2.65＝26.493+70.278-x
    （26.493+x）×2.45＝26.493+70.278-x
    x+30/（1+20%）-x/（1+30%）=4
    a∧3-24a+32=0
    x=2484958/(7021.84-4.96x)
    874x*2.8x*2.2*1.2=10000
    26÷x=65%
    1000/(1+x)+2000/(1+x)^2+6000/(1+x)^3+4000/(1+x)^4 = 7000
    1000/(1+x)+2000/(1+x)^2+6000/(1+x)^3+4000/(1+x)^4 = 7000
    1000/(1+x)+2000/(1+x)^2+6000/(1+x)^3+4000/(1+x)^4 = 7000
    1000/(1+x)+2000/(1+x)^2+6000/(1+x)^3+4000/(1+x)^4 = 7000
    1000/(1+x)+2000/(1+x)^2+6000/(1+x)^3+4000/(1+x)^4 = 7000
    abs(x-1/x)=1
    1.5*(4054801+x)+12815+722083+126590=7180800
    1.5*(4054801+x)+12815+722083+126590=6038400
    4054801x
    56Q-(580+40Q)-(56Q*0.13-5Q)*0.12=0
    0.583＝8708.7e^36.43x
    0.583＝8708.7e36.43x

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