50 = 34.566ln(x) - 5.2666
    x^5+10x^3+20x=4
    （5x+4）×（6x−7）
    84.1 = 35.268ln(x) - 6.3562
    50 = 35.268ln(x) - 6.3562
    （60-x－40）（300-50x）
    50 = 35.268ln(x) - 6.3562
    84.1 = 34.661ln(x) - 5.4243
    50 = 34.661ln(x) - 5.4243
    tanx-x＝0.0567
    tanx-x＝0.0567
    84.1 = 35.888ln(x) - 7.0043
    50 = 35.888ln(x) - 7.0043
    1x+1=2x-2
    3x+1=2x-2
    （39.402+x）×2.15＝39.402+72.604-x
    （39.402+x）×1.95＝39.402+72.604-x
    x*1.54=2.68
    0.434=0.137*Z^（-3）+0.119*Z^（-2）+0.269*Z^（-1）-0.019
    32x^3-16x+1=0

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