20（1+x）^2+400(1+x)=440
    32.49=(17.57+45.21+8.5562x)*x/2
    400x^2+399x-1=0
    400x^2+399x-1=0
    400x^2+399x-1=0
    400x^2+399x-1=0
    400x^2+399x-1=0
    400x^2+399x-1=0
    400x^2+399x-1=0
    400x^2+399x-1=0
    400x^2+399x-1=0
    400x^2+399x-1=0
    400x^2+399x-1=0
    400x^2+399x-1=0
    400x^2+399x-1=0
    400x^2+399x-1=0
    400x^2+399x-1=0
    400x^2+399x-1=0
    400x^2+399x-1=0
    400x^2+399x-1=0

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