1＋3x
    0.2=(30×0.15+50x）÷80
    x^2+2x-3=1/3x+1
    21.335x - 8.673=50
    20.667x - 8.669=50
    0-0.3-(-90) = x
    0+0.3-(-90) = x
    0+0.3-(-90)=x
    21.668x-11.67=50
    x-X*0.05=19.7
    11.666x+5.9981=50
    11.471x+6.1156=50
    9000{[x（1+x）^10]/[(1+x）^10-1]}=1000
    [9000*0.019630（1+0.019630）^10]/[(1+0.019630）^10-1]=x
    [9000x（1+x）^10]/[(1+x）^10-1]=1000
    [9000x（1+x）^10]/[(1+x）^9]=1000
    9000x（1+x）^10/(1+x）^9=1000
    120-40% x=2/3
    11.471x+2.1156=50
    x^10+x^9+x^8+x^7+x^6 = 7

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