x÷3+620-x=620
    11.196x-1+1/（1+x）^20=0
    a^3+3a^2+6a+2=0
    -3000-1000x^（-1÷2）-200x^（-1）-200x^（-3÷2）-200x^（-2）+200x^（-3）+400x^（-7÷2）+600x^（-4）+800x^（-9÷2）+800x^（-5）+800x^（-11÷2）+800x^（-6）+3000x^（-13÷2）=0
    e∧x-sinx
    e∧x-sinx
    (q^21-1）/（q-1）=24.63
    -3/2x²+8/3x=2
    -3/2x²+8/3x=2
    -3/2x²+8/3=2
    -3/2x²+8/3=2
    2x∧2-6x＋3
    -3/2x+8/3=2/x
    -3/2x+8/3=2/x
    -3/2x+8/3=2/x
    x=tan(x)
    lnx＝-0.585
    k^2+59k+672
    4s^3+72s^2+200s+400
    2xx-4x=5

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