5% x+5.5% x（200-x）=10.6
    1.8x-80=x+80
    x^6+4x^4+36x^2-36=0
    x-1/3x²
    1.5x-11*2=27.5
    1.5x-11*2+27.5
    3x-3.2-x=10
    x^4+4x^2-108=0
    (x+81)÷10=x
    x∧3+x=1
    x*3+x=1
    86=x/1.1+x*1.25/1.1^2+1.25^2*x/1.1^3+1.25^2*1.15*x/1.1^4+(1.25^2*1.15*1.06*x/0.04)/1.1^5
    x-（x*0.06）=544
    (13.23%-x)/1.25=(9.67%-x)/0.87
    (13.23%-E(RF))/1.25=(9.67%-E(RF))/0.87
    1.25*(13.23%-F)=0.87*(9.67%-F)
    (atan (10))+(atan (9/11))=C
    atan 10+atan (9/11)=C
    atan 10+atan 10-1/10+1=C
    atan 0+atan 0-1/0+1=C

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