65435656=10^9*a/(6.25-a)/(12.5-a)
    65435656=10^9*a/(25-a)/(12.5-a)
    e^(-(-74.163+6.63*4.19)*1000/8.314*310)=a
    65332488=10^9*a/(25-a)/(12.5-a)
    e^(-(-74.163+6.63*4.19)*1000/8.314*310)=10^9*a/(25-a)/(12.5-a)
    (0.25)*(2*x^4-4*x^3-6x^2+8x+12)=0
    3y-1/4-1=5y-7/6
    3(x+3)+x=2x-4
    log(2,x)=100000000
    x=tanx
    x+1/（x-1）
    （15140+200+x）*2.2%=4x
    （15140+200+x）*3.3%=4x
    2000*50000=x+1000*50000+150*50000
    300x=280+150x+3x
    41.1=33.8/(100-w)
    400x=1500+160x+8x
    4-X=X+4
    X-(X-4)=4-(X-4)
    62500/11326=(x*(1-x^10))/(1-x)

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