40x＋30(20－x)＝650
    X/3150+X/1000=1
    377.364484+60/(1+2.75%)^8+60/(1+2.75%)^9+60/(1+2.75%)^10+1000/(1+2.75%)^10
    5.6×40＝x×32
    60/(1+2.75%)^1+60/(1+2.75%)^2+60/(1+2.75%)^3+60/(1+2.75%)^4+60/(1+2.75%)^5+60/(1+2.75%)^6+60/(1+2.75%)^7
    x 2 (x+1)=0
    x^3-10x^2=0
    x^3-3x-1=0
    4-4xx-3xx＝xx-xxxx
    4-4xx-3x＝xx-xxxx
    27.11*((1-1/(1+0.43)^120)/0.43%)
    65000*(1*0.5%^120)/((1+0.5)^120-1)
    x^3-200x^2+10000x=0
    (1+0.5%)^120
    ((1+(1+0.5%)^120))/((1+0.5%)^120-1)
    1+(1+0.5%)^120/(1+0.5%)^120-1
    1+(1+0.5%)^120
    101.86*(1+x)^2-9*(1+x)-109=0
    (1+(1+0.5%)^120)/((1+0.5%)^120-1)
    65000*((1+(1+0.5%)^120)/((1+0.5%)^120-1))

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