ln(0.87/0.76)=x/8.314
    ln(0.76/0.87)=x(-30/1000×1030)/8.314
    15.21+151.17+29.46-x=56.07
    log2(1)=x
    log2(x)=0.3
    log2(x)=1
    log2(x)=0.3
    9+X=（6+X）×2
    x+x*0.08=424
    4^x=x^8
    x^2+x-1=0
    x^3-3x^2-6x+8=0
    (1+x)^365-1=757.22
    (1+x)^365-1=7.5722
    m^3-8m^2+20m-15=0
    m3-8m2+20m-15=0
    √29X=10
    5X-X^2=10
    400÷500＝25÷x
    x^(1/x)=3^(1/3)

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