1/d+1/(d+2)=1/(1-d)
    12.1c=（3.4+c）×7.93
    12.1c=（3.3+c）×7.93
    13-2x=x+1
    (x+(3+3^(1/2))/2)(x+(3-3^(1/2))/2)
    30x×1/6
    6x+5x-(6x-1/6)=180
    8x^4+8x^3-8x^2+3=0
    6083700*（1-3.06%）-6062.23-2275491.48-（6083700/1.09*0.09-2275491.48/1.13*0.13-x/1.03*0.03）*1.12=x
    3x+6=x+7
    3x+6=x+7
    3x+6=x+7
    1/d+1/(d+1)+1/(d+2)=1/(d+10)
    d^3+16.5*d^2+3*d+10=0
    X-0.3X+700=X+1/6X
    120X+232*（20407.81-X）=1514389.08
    120X+232*（20407.81-X）=669925.44
    21x^2-15x-2=0
    120X+232*（20407.81-X）=442425.44
    -78.975+84.5/（1+x/12*6）+0.325/（1+x/12*13）=0

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