（d^2+6d+13)*(2d+1）+(d^2+d)(2d+6)=0
    （d^2+6d+13)*(2d+1）+(d^2+d)(2d+6)=0
    （d^2+6d+13)*(2d+1）+(d^2+d)(2d+6)=0
    1/d+1/(d+1)+1/(d+3+2√-1)+1/(d+3-2√-1)=
    X^16=1
    d^2+3d-3=0
    10(10-x)+xx2-1=10x+(10-x)
    10(10-x)+xx2-1=10x+(10-x)
    2［10(10-x)+x ］-1=10x+(10-x)
    1/x+1/（x+2）+1/（x+3）=1/（x+5）
    2［10(10-x)+x ]-1=10x+(10-x)
    2x^3+20x^2+50x+10=0
    ［10(10-x)+x ］x2-1=10x+(10-x)
    2［10(10-x)+x ］-1=10x+(10-x)
    2［10(10-x)+x ］-1=10x+(10-x)
    ［10(10-x)+x ］x2-1=10x+(10-x)
    10(10-x)+xx2-1=10x+(10-x)
    100x=tan(x)
    a/(a-900)=4
    a/(a-900)=4

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