（4x-15）X4=x
    X+（5000-120X）/10000=3.4540
    X+（5000-60X）/1000=3.4540
    （4x-7）/((20x^2-72x+81))^1/2=(18-x)/((17x^2-100x+452))^1/2
    （4x-7）/（(20x^2-72x+81)）^1/2=(x-18)/((17x^2-100x+452))^1/2
    （4x-7）/(20x^2-72x+81)^1/2=(18-x)/(17x^2-100x+452)^1/2
    （4x-7）/(20x^2-72x+81)^1/2=(x-18)/(17x^2-100x+452)^1/2
    0.16x+54.4+66.6/39.22=12.8x-246/795
    84.1 = 35.76ln(x) - 1.9126
    50 = 35.76ln(x) - 1.9126
    84.1 = 34.898ln(x) - 3.4817
    50 = 34.898ln(x) - 3.4817
    X+X*0.1=218881
    X+X*0.1=214389
    X+X*0.1=214389.2
    84.1 = 34.409ln(x) - 2.7654
    50 = 34.409ln(x) - 2.7654
    50 = 34.409ln(x) - 2.7654
    50 = 34.409ln(x) - 2.7654
    x^5-15x^4+85x^3-225x^2+274x-120=0

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