2x^2+x-2=0
    (15-x)*(20+4x)=396
    x*(30-3x)=48
    x(x+40)=9600
    (15-2x)*(10-x)=88
    x*x-9.3x+14.6=0
    x^3+20.93x^2+0.4x-0.14=0
    2/x+1/（x+9）=1/（x+5）
    xln（x/0.034）=0.0659
    xln（x/0.034）=0.0598
    (10x+3)*6528=(30+x)*8256
    (x-887)/4.0979=x^(2/3)
    (x-887)/4.098=x^(2/3)
    x-887=4.098*x^(2/3)
    x-7236=3*x^(2/3)
    x^3-20x^2-4775x-356250=0
    3x^3 + 24x^2 + 54x + 48 = 0
    X^2-2X-3=0
    (x-x/1.09*0.03)*0.02=77467.52
    x（x+1）+2x

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