3X+3=2X+7
    49/x-144/(4-x)=1
    10^x=-8
    （x-23）/2+（x-19）/4+(x-15)/6+(x-11)/8+(x-7)/10=10
    1/7x+1/4x+10=3/7x
    0.05×x×x-x+0.0005=0
    x^2=38.360681(62.57-x)
    x^2=1.399735*(62.57-x)
    1+x+2^x=9
    （60-x）（200+20x）=24500
    （60+x）（200+20x）＝24500
    x²-70x+325＝0
    （120-x）（160+2x）＝20000
    2/2-x -3=3/x-6/2x+3
    √(x^2)
    （x-2）*27=391
    18*18-x=298
    （54-2x）/1.57+x+40＝50+x
    37%x=180
    （x-13）*8=8

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