1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*2.107298)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*2.107298)
    x＾3＋2x＾2＋10x－20＝0
    2x+4/x
    4x^2+4x+1
    x*1.02=1953.72
    x*1.02=1953.72
    x*1.02=1953.72
    x*1.02=1953.72
    8*x^2+32*x+32=x+3
    0.75x+0.08x^2×0.8=63
    0.75x+0.08x^2×1.5=63
    x^3+3x^2-4x-8=0
    ((54.9+x)*1.065-x)*0.02=x
    ((55.31+x)*1.065-x)*0.02=x
    x(x－1)＝240
    (0.88x+1.5)^2+(0.4743x)^2=9
    (202727.37-x)*0.07+(79892.3+x)*0.1=22201.24
    1.06*x=16.0102
    1.06*x=16.0102

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