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    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
    1/4x=2/1x+3
    4/1x=2/1+3
    2/1x-4/1x
    X-9=4x+27
    11x-2=14x-9
    8/5x=5x-3
    25X=11
    3x=8
    4:x=1:1
    (x+300):(3x-300)=1:2
    (157.05-c)×8.22=(161.9-c)×8.02

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