-4.245（sin（140.454/（15-0.3x））-0.0823x）+0.9=3.34
    1200=120/i[1-1/(1+i/2)^20]+1000/(1+i/2)^20
    1200=120/i[1-1/(1+i/2)20]+1000/(1+i/2)20
    -4.245268（sin（140.454/（15-0.3x））-0.0823x）+0.9=3.34
    120/i[1-1/(1+i/2)10]+1000/(1+i/2)10=1200
    1+X=7.5X
    (1.1085 * 4144.96) + (1.0765 * x) = 1.0999 * (4144.96 + x)
    1.5a/(a-400)=0.7
    2x^2+12x-14
    x=-10996*(1.128^(-1))-31011*(1.128^(-2))
    (21+d)(21+4d) <(21+11d)
    x=-10996*(1.128^(-1))
    0.4-0.5*a=0
    565x+9000=28280
    565x+9900=28280
    565x+10800=28280
    565x+11700=28280
    565x+12600=28280
    565x+13500=28280
    565x+14400=28280

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