x-（-33.5）/-17.7-x = 19/6
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.90007)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*2.0845)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*2.07317)
    ln(x/0.00635)=0.017434/x
    ln(x/0.00635)=0.005616/x
    ln(x/0.00476)=0.005616/x
    ln(x/0.00476)=0.017434/x
    ln(x/0.003)=0.017434/x
    ln(x/0.003)=0.005616/x
    3/x+1/3x=5/6
    4Y^2-40.6Y+48=0
    x-(x/1.05)=520
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=91.503
    X/0.1469-136.47=X
    -x^2+6x-8
    （5-x）^2+4x^2=25
    （5一x）x=4
    （5一x）x
    ln(x/0.00635)=0.0174198/x

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