101.6/(1+X/12*12)=79.8
    25950/(1+x/12*6)+25950/(1+x/12*7)+25950/(1+x/12*8)+25950/(1+x/12*9)+25950/(1+x/12*10)+25950/(1+x/12*11)+25950/(1+x/12*12)=50000
    80000+450X=130000+400X
    (x-18000)÷x=0.6
    7115*X=142.3
    （68800/x）*1000=1
    （68800/x）*1000=1
    68800/x*1000=1
    68800/x*1000=1
    X×3.15＝149.331-x
    X×3.15＝149.331-x
    X×2.95＝149.331-x
    X×2.75＝149.331-x
    X×2.55＝149.331-x
    X×2.35＝149.331-x
    X×2.15＝149.331-x
    3a²➗a²＝
    8+x/2=22-x/5
    x/3-4=x/5+12
    x²+（8-x）²=2x²

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