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
    127.820*99.975%-x*100.025%=0.5/10
    127.820*99.975%-x*100.025%=1/10
    (30x/628000)-9.1=30x/979060
    (x/628000)-9.1=x/979060
    200/（x√（0.01x²+1））=1
    200/（x²√（0.01x²+1））=1
    （3.45+1.5*x）*x=5.48*1.2

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