(1044-35/x)/(1＋x)^48＝1000/x-35
    A＝（240－A）÷2
    100²/(x－100)²=0.533
    0.533(x－100)²=100×101.325
    0.13*x+x=7684
    220*3.81+X*7.93=(X+220)*4.32
    220/3.81+X/7.93=(X+220)/4.32
    990 * x * (1+x)^9/ ((1+x)^9-1) =106
    31*8+23*x=50*31
    31*8+61*x=50*31
    9900 * x * (1+x)^10 / ((1+x)^10-1) =2000
    9900 * x * (1+x)^10 / ((1+x)^10-1) =1060
    990 * x * (1+x)^10 / ((1+x)^10-1) =106
    0.01X+X=
    0=240x-2200-1980-12720
    x-x/1.01*0.01=11835
    x-x/1.01*0.01=22603
    (19.64+7.75x)*(43.05+7.75x)/(7.75-7.75x)/(12.23-7.75x)=23.335
    x-x/1.01*0.01=71356
    x-x/1.01*0.01=11835

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