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    x=1
    1.18323=1/(1.647*x)
    200*(15%-x)=100*(x-10%)
    X*ln(X/9.36)=11.5
    (0.4X-3435)/500=(0.4X-3195)/750
    x*ln(x/9.36)=11.5
    1200/1.5x-600/x=40
    1200/1.5x-600/x=40
    1200/1.5x-600/x=40
    1200/1.5x-600/x=40
    1200/1.5x-600/x=40
    3600/x=2400/1500-x
    x^2+12x+100+40=x^2+100
    x^2+100+40=x^2+12x+100
    x^2+100+x^2+12x+100=40
    sqrt(x^2+100)+sqrt(40)=sqrt(x^2+12x+100)
    sqrt(x^2+100)+sqrt(x^2+12x+100)=sqrt(40)
    X-x/20=7.6
    X-x/20=7.6
    0.88x=x-39

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