172.1599-0.014286x=165.3899+(x-11.4)/4
    172.1599+0.014286x=164.9699+(x-11.4)/4
    x^(2)+x+4
    arctan(35.4/2)-arctan(35.4x5)
    12000/(1+i)-1680/(1+i)^2=8040
    arctan(35.4/2)
    x*x=2
    x=2
    -3/-9
    2(x+x^2+x^3+x^4+x^5+x^6+x^7) = 100
    1-1/（1+i）^20=0.67i
    2/-3
    -3÷2
    -3/2
    16.951611+2*(15+4.619x/1.5163)*0.021791=x
    (X-5):5／2=4-1／5X
    16.951611+2*(15+4.619x/1.5163)*0.021791
    0.0043*x^-0.095+0.26*x^-0.47=0.005
    100x-x=18
    x^(2)－132x＋64＝0

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