1/6x+1/7x+1/12x+9=x
    2/x-2/x^2*(1-e^(-x))=0.1065652
    2/x-2/x^2*(1-e^(-x))=0.132595753
    x+5+1/2x+4=2x
    2/x-2/x^2*(1-e^(-x))=0.530097593
    x^2
    11＋3(n－1)
    25x+9=2x
    33/84x+9=2x
    0 = 0.0314x + 1.9219
    0 = 0.0205x + 3.9959
    0 = 0.0412x + 3.4836
    0 = 0.0673x + 5.5658
    0 = 0.0572x - 0.5357
    （x+1）lnx
    0 = 0.0371x + 9.3477
    0 = 0.0408x + 11.094
    0 = 0.0462x + 7.2673
    0.043=0.053*x/(0.996*sqrt(1-x^2)+0.087*x)+0.01*x
    （1-1/5）（3.1-x）=（1-1/4）x

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