-0.040x^2+0.684x-2.8276=0
    -0.042x^2+0.7386x-3.1142=0
    (840*1.0035^n)/(1.0035^n-1)=3069
    -0.0444x^2+0.7938x-3.4066=0
    x=（（x^2-2）^2-2）^2-2
    x∧2+5x+25=0
    x÷0.7-（0.17-0.2x）÷0.03=1
    -0.0468x^2+0.858x-3.752=0
    -0.0468x^2+5.4396x-4.0332=0
    -0.156x^2+5.4396x-4.0332=0
    2a(3a-1)-3(2-5a+3a²)
    -0.048x^2+0.9066x-4.0332=0
    -0.0504x^2+0.9528x-4.2806=0
    -0.0516x^2+0.9954x-4.5236=0
    12000（1-x）^2=7680
    3-6x^2-4*3^(1/2)*x^2*(x^2-1)^(1/2)
    3-6x^2-4*3^(1/2)*x^2*(x^2-1)^(1/2)
    9.9x-99=9.9
    -0.0696x^2+1.2024x-4.9332=0
    7x+9=88

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