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
    ln(x/0.00635)=0.00561626/x
    8x^2-32x+82
    ln(x/0.00635)=0.1406618/x
    ln(0.00635/x)=-0.1752873/x
    ln(0.00635/x)=0.1752873/x
    ln(x/0.00635)=0.01752873/x
    ln(x/0.00635)=0.1752873/x
    x^4-4x^3-27x^2+52x-26＝0
    rice cooker
    1/4x=1/2x+3
    1/4x=1/2+3
    4/1x=2/1x+3

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