x=15%x+40041.72+6.72%x+680.71
    x=15%x+40209.72+458.62+6.72%x
    x=15%x+40209.72+458.62+6.72%
    x=15%+40209.72+458.62+6.72%x
    x=40209+4858.62+0.067x+0.15x
    0.16*(18+x)*(18+x)/((13+x)*(13+x))=1.25
    8647=273560*i*(1+i)^36/((1+i)^36-1)
    8647=273560*i*(1+i)^36/(1+i)^36-1
    8647=273560*i*(1+i)36/(1+i)36-1
    5x+100
    lgx=15.5
    x＾2-60x+300=0
    (91.43+x)/(260+X)=0.375
    x/(3%)-52.6316-16.2778-((x-48.4211-14.9756)/(0.0176%))
    x=(x*6.72%)+124688.02
    4.94∧（n+1）=0.99
    15.6×a×0.6=5.2
    x+x/60=800
    x+x/60=800
    13.5×a×0.6=4.5

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