(x+1)lnx^2-3x=1
    (x+1)lnx^2-3x^2=1
    (x+1)lnx^2-3x^2=0
    27.2x+x＾2=18.9
    x^2=1.77×10^-5×（0.3-x）
    x+14/100+x=55
    （10+2x）（76-4x）=1080
    4(2x-1)^2-25(x+1)^2=0
     (7x-10)^2-9x^2=100
    x^33x+2 = 0
    87.5=（0.021L^1.85+3364）^0.5*L^0.84
    （25.851+x）×2.55＝51.702+69.853-x
    （25.851+x）×2.35＝51.702+69.853-x
    （25.851+x）×2.15＝51.702+69.853-x
    （25.851+x）×1.95＝51.702+69.853-x
    （25.851+x）×1.75＝51.702+69.853-x
    （25.851+x）×1.55＝51.702+69.853-x
    （25.851+x）1.55＝51.702+69.853-x
    （x^2-1）/（x-1）
    2*（240-x）-222=446

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