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
    （2.5+1.5*x）*x=1.2*4
    b*b*b-b-1=0
    ex=2e
    -3.14x/e√(1-x^2)=0.163
    4151.32=20x+20*8
    8*80+20*x=4151.32

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