oae-266
    x(x+2)=3x+6
    x-34-5/12x=0.3
    x-34-7/12x=0.3
    x-7/12x-34=0.3
    x-(7/12-34)x=0.3
    7/12x-34x=0.3
    X/（0.1X）=131.75/357.75
    X/0.1X=131.75/357.75
    X/X+10%=131.75/357.75
    x = (x+140000)/1.06*0.06*1.12
    x = (x+150000)/1.06*0.06*1.12
    x = (x+15000)/1.06*0.06*1.12
    x=(x+13000)/1.06*0.06*1.12
    x=(x+13000)/1.06*0.06*1.12
    x=(x+13000)/1.06*0.06*1.12
    x=(x+13000)/1.06*0.06*1.12
    （2.9+1.5*x）*x=0.4*3.88
    （2.9+1.5*x）*x=1.2*3.88
    （1＋1/n）^n

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