441558*(x/((1+x)^13-1))=280284.75
    280284.75*(((1+x)13-1)/x)=441558
    280284.75*(((1+x)^13-1)/x)=441558
    280284.75*(x/((1+x)^13-1))=441558
    280284.75*(x/((1+x)13-1))=441558
    (x-18)/x=0.5
    (x-29.2)/x=0.5
    (x-15.6)/x=0.5
    (x-21.5)/x=0.5
    (x-16.5)/x=0.5
    (x-6)/x=0.5
    (x-9.5)/x=0.5
    (x-5.075)/x=0.5
    (x-7)/x=0.5
    (x-5.5)/x=0.5
    (x-5.5)/5.5=0.5
    1.5x^2=22
    15%=(x-1.23)/x%
    x-15/x=1.23
    480x-100(x+1)=50(7x+1)

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