3x/2=9/（6x+8）+3/（2x）
    3x/2＝9/（4x+8）+3/2x
    （1000-10x）÷√x=2
    （26.493+x）×2.45＝26.493+69.278-x
    （26.493+x）×2.65＝26.493+69.278-x
    （26.493+x）×2.85＝26.493+69.278-x
    （26.493+x）×3.05＝26.493+69.278-x
    （26.493+x）×3.05＝26.493+70.278-x
    （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

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