2^x/ln10-7x=-31
    2^x/ln10-7x=-5
    2^x/ln10-7x=0
    2^x/ln10-x=0
    -x+2/x
    n（n+2）=3830000000000000000
    x^3-x^3/1
    arctan0.1x+arctan0.5x=π/2
    arctan0.1x+arctan0.5x=3.14/2
    arctan0.1x+arctan0.5x=90
    arctan0.1x+arctan0.5x=-180
    arctan0.1x+arctan0.5x=180
    12.825X^2-110.6X+221.2=0
    xx
    x
    tanx-x＝0.04
    12.825X^2-110.6X+221.2=0
    -100000+25000/(1+x)
    -100000+25000/1+x
    tanx-x=0.04

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