10%=x/1000+x
    (20-3x)(8-2x)=56
    (8×2×3x)(6+2x)=5/12
    （1+1/x）^ln（1+1/x）=2
    4^x-x^2-2x-1=（x+1）2^x
    （x+1）2^x=0
    x=e^(x^2)
    x=126.05×e^(x^2÷52488)
    0.669=ln(x/106.45)+(26244-x^2)/52488
    n^2+2n=55
    n2+2n=55
    (x-2)e^x+1
    sinx²
    240/（x/120%）+1/3+2/3+240/x=480/（x/120%）
    (3.16%-X)÷X=30.84%
    50x²+1521-158x=0
    x²＋2700x-4109.4＝0
    0-x=5
    lgx＝0.26
    lgx＝1.76

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