0.4*3.33*x=4.06
    0.4*0.61*3.33*x=4.06
    0.79*0.7*x*2.47=3.75
    x+(x*0.225)=2.39
    -2.73x^2+35.08x+22.18=0
    0.4+x-0.4x=0.7
    x^2-60x-300=0
    (N+1)/2*N=105
    N+1*2N=210
    2x^3+11x^2+20x+8=0
    0.4*0.61*x*3.33=2.35
    0.79*0.77*x*1.96=2.94
    lgx＝1.35135
    lgx＝-1.35135
    75-5x=4*sqrt(81+(15-x)^2)
    2x^3+11x^2+20x+8=0
    2x^3+11x^2+20x+8=0
    0.71x+1-x=0.997
    0.8129x+1-x=0.997
    0.8129x+1-x=0.996

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