32.78x/44.63-44.62*44.62*1091744.45/x/x/32.78/32.78=-49
     3X+15=4X+5
    600÷x=450÷（x+10）
    x-1091744.45/x/x=-49
    128=sin（πx）^2/sin（πx/16）^2
     x^2+1=0
    x÷3 = 1.2
    x÷3=1.2
    297*x*x+108*x+168=0
    2.5x=14
    0.061 = 0.2493ln(x) + 0.108
    0.047 = 0.2493ln(x) + 0.108
    6.4% = 24%a + 24% + a
    x^2/（0.05-x）=1.8×10^-5
    0.5xxxx-xxx/3=0.15
    x2/（0.05-x）=1.8×105
    0.413x^2-2.239x+0.826=0
    413x^2-1826x+413=0
    x^2+2x+2=0
    2.95=x/（1-x）^2

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