（26.326+x）×2.15＝52.652+71.278-x
    （26.326+x）×2.35＝52.652+71.278-x
    （26.326+x）×2.55＝52.652+71.278-x
    （y²/2）+y/2＝2025
    x+7%x=31
    x^6-6x^5-15x^4-20x^3-15x^2-6x-1=0
    x+8%x=14
    x＋8%x=4
    (x+1)(x-2)(2x-1)
    (x+1)(x-2)(2x-1)=
    10^7=10^9*x/((12.5-x)(25-x))
    10^7=10^9*x/((12.5-x)(6.25-x))
    2x+1/3=1-x-1/5
    2x+1%3=1-x-1%5
    2x+6=3x-8
    4x-6=10(x-6)
    1/((2-x)(2-x))-1/(xx)=0
    1/((2-x)(2-x))-1/xx=0
    1/(2-x)(2-x)-1/xx=0
    （59+59+59+59+59+125）×（1+r）^-5=1000

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