2 * sin(x) + 3 * cos(x) = 0
    ln1/2x
    X+X*0.2=17.37+12.12
    X+X*0.2=29.49
    X+X*0.2=20
    100(1-x)^3 = 1+x
    (x + 3)^3 + (x + 4)^3 = 251
    （593350.85+x）*1.13=670487.74
    ㏑（tan√x）
    1+N+(N+1)N=43
    1.43*(1+53*((3.98/x)^2)*ln(x/3/3.98))=1.96
    3.976*sinx/x+cosx-cos2.255=0
    3.976*sinx/x+cosx-cos2.25=0
    x²/x²+1
    x^3+x^2+18=0
    19t^2-240t+225=0
    c2－2√2c－4
    X-578.52-(X-578.52-15000)*3%=45927.38
    X-578.52(X-578.52-15000)*3%=45927.38
    X-(X-578.52-15000)*3%=45927.38

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