x^x=196^7
    x^x=196
    x^x=14
    x^x=7
    x^(x^7)=196
    th0.90543
    （27000-P）（0.45-0.5）=
    1.61x^x-0.771x+0.161=0
    x^2+x+2020 = 0
    xtanx=0.6678
    x^5+4*x^4+4*x^3+8*x^2+10*x+6=0
    xtanx=0.6678
    xtanx=0.6678
    arctanx+arctan（0.2x)=54
    arctanx+arctan0.2x=54
    arctanx=7
    arctanx=180
    arctanx=1
    cosx^1/3
    x^5+x+1

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