Mathematics
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    -2000+500/(1+r)+700/(1+r)^2 +2000/(1+r)^3 >-10000+8000/(1+r)+2500/(1+r)^2 +2000/(1+r)^3
    80r^2-13+8500r>0
    -2000+(500/(1+r))+(700/(1+r)^2)+(2000/(1+r)^2)>-10000+(8000/(1+r))+(2500/(1+r)^2)+(2000/(1+r)^2)>0
    -2000+(500/(1+r))+(700/(1+r)^2)+(2000/(1+r)^2)>-10000+(8000/(1+r))+(2500/(1+r)^2)+(2000/(1+r)^2)
    [-2000+500/(1+r)+700/(1+r)^2+2000/(1+r)^3]>[-10000+8000/(1+r)+2500/(1+r)^2+2000/(1+r)^3]
    8000t^2-7500t-1800>0
    -2000+500/(1+x)+700/((1+x)^2)+2000/((1+x)^3)>-10000+8000/(1+x)+2500/((1+x)^2)+2000/((1+x)^3)
    (1+r)^2*500+700+700r>(1+r)^3*(-8000)+2500+2500r
    80(1+r)^2>75(1+r)+18
    80r^2+157r+59>0
    -2000+500/1+r+700/(1+r)^2+2000/(1+r)^3>-10000+800/1+r+2500/(1+r)^2+2000/(1+r)^3
    -2000+500/(1+i)+700/(1+i)^2+2000/(1+i)^3>-10000+8000/(1+i)+2500/(1+i)^2+2000/(1+i)^3
    -2000+500/1+i+700/(1+i)^2+2000/(1+i)^3>-10000+8000/1+i+2500/(1+i)^2+2000/(1+i)^3
    (-2000+500/(1+x)+700/(1+x)^2+2000/(1+x)^3)>=0
    (-10000+8000/(1+x)+2500/(1+x)^2+2000/(1+x)^3)>0
    (-2000+500/(1+x)+700/(1+x)^2+2000/(1+x)^3)>0
    -2000+500/(1+r)+700/(1+r)^2>-10000+8000/(1+r)+2500/(1+r)^2
     -2000+500/(1+r)+700/(1+r)^2+2000/(1+r)^3 <-10000+8000/(1+r)+2500/(1+r)^2+2000/(1+r)^3
    (-2000+500/(1+x)+700/(1+x)^2+2000/(1+x)^3)>(-10000+8000/(1+x)+2500/(1+x)^2+2000/(1+x)^3)
    (-2000+500/(1+9%)+700/(1+9%)^2+2000/(1+9%)^3)>(-10000+8000/(1+9%)+2500/(1+9%)^2+2000/(1+9%)^3)

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