（1-q^10）/（1-q）=20
    （1-q^10）/（1-q）=10
    A=29498400+134640+A*0.0015+A*0.06+0.0072*A
    9250=340/(10%-x)
    9250=340/1.1+[340*(1+x)/(10%-x)/1.1]
    18+9.1+x2.8*3+12.4X=23.5x/1.06
    18+9.1+x2.8*3+12.4X=23.5x/1.06/1.2
    18+9.1+53.8+12.4X=23.5x/1.06/1.2
    x+4/2x-1
    7y-467.56-(7y*13%-112-14)*10%-(7y-467.56)*25%=260+88.2
    7y-467.56-(7y*13%-112-14)*10%-(7y-467.56)*25%=260
    18+9.1+53.8+12.4X=23.5x/1.06
    7y-467.56-(7y*13%-112-14)*10%-(7y-467.56)*25%=0
    7y-467.56-(7y*13%-112-14)*10%-(7y-467.56)*25%=260
    7y-467.56-(7y*13%-112-14)*10%(7y-467.56)*25%=260
    7y-467.56-(7y*13%-112-14)*10%(7y-467.56)*25%=260
    18+9.1+X2.8+12.4X=23.5x/1.06
    7x-467.56-(7x*13%-112-14)*10%(7x-467.56)*25%=260
    7x-467.56-(7x*13%-112-14)*10%(7x-467.56)*25%=260
    18+9.1+53.8+（X-6.3）2.8+12.4X=23.5x/1.06/1.2

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