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+r)^1 +700/(1+r)^2 +2000/(1+r)^3 <0
    -2000+500/(1+r)^1 +700/(1+r)^2 +2000/(1+r)^3 ≥0
    -2000+500/(1+r)^1 +700/(1+r)^2 +2000/(1+r)^3 >-10000+8000/(1+r)^1 +2500/(1+r)^2 +2000/(1+r)^3
    x/3≤3-(x-2)/2
    4x-7<5(x-1)
    38x^2+90x-1800＜0
    39x^2+90x-1800＜0
    -10000+8000(1+r)^-1+2500+(1+r)^-2+2000(1+r)^-3<0
    x+500>2x
     240 + 120 * x >144 * x + 144
    -2000+500/(1+i)+700/(1+i)^2+2000/(1+i)^3>-10000+8000/(1+i)+2500/(1+i)^2+2000/(1+i)^3
    144x+144<240+120x
    -2000+500(1+r)^-1+700(1+r)^-2+2000(1+r)^-3<0
    310x+460(50-x)≤18000
    （72+86+x)/3≥80
    (5x-1)/3≤x+1
     -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 + r) + 700/(1 + r)^2 +2000/(1 + r)^3>-10000 + 8000/(1 + r) +2500/(1 + r)^2 + 2000/(1 + r)^3
    -10000x^3+8000x^2+2500x+2000>0

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