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    R^2*(2-4R)=0
    3*n^2+5*n-40=0
    x^3+x+0.5=0
    (164+434)/31*x+155/31*(x+15)+93/31*(x+30)=773
    -x²+4x+1
    104 = 4/(1+y) + 4/(1+y)^2 + 4/(1+y)^3 + 4/(1+y)^4 + 4/(1+y)^5 + 104/(1+y)^6
    -11040x²+23294400x=1663800000
    6x²+6x+1=0
    -1/x
    (3+1/x)/(2-1/x)=
    x²-x
    3+1/x/2-1/x=
    3+1/x/2-1/x
    1/d+1/(2+d)=1/(1+d)
    x/(0.1-2*x)^2*(0.025-x)=1.26*10^21
    e1/2lnx
    lgx=21.892
    100w^2十10000=1/10000w^6十w^4
    x²-x-6=0
    (x-1/2)(x-3/2)=0

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