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    (1+0.25*10*x)*(1+x)/0.25=0.18
    3.496728*(1.075+x)*(1.065+x)*(1.055+x)=(1.065+x)*(1.055+x)/1.070045+(1.075+x)*(1.055+x)/1.07+(1.075+x)*(1.065+x)/1.06+(1.075+x)*(1.055+x)/1.06
    2=v*v/19.6+0.0653*1250*v/19.6
    (1+0.2*10*x)*(1+x)/0.2=0.18
    (l-ln5)/25-(ln5-1)/(ln5)^2 = 0
    (l-ln2)/4-(ln2-1)/(ln2)^2
    2x^2−8x−4=0
    3x^2−18x+36=0
    (1-lnx)/x^2-(lnx-1)/(lnx)^2=0
    -x-2=-3x+5
    (1+0.15*20*x)*(1+x)/0.15=0.35
    (800×12×0.9-70%×130X×0.65%)÷(30%×130X+5%×130X)=3.8%
    -1x+3x
    (1+0.1*20*x)*(1+x)/0.1=0.35
    (1+0.1*20*x)*(1+x)/0.1=0.18
    72:36=x:24
    13÷x=1.3
    x^2+1.05497829*x-0.00534801=0
    N/(3N+48)=50/168
    (x-2)*(x-2)(x+1)-18*x-20=0

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