12.3c=（3.4+c）×7.92
    12.3c=（3.4+c）×7.92
    12.3c=（3.4+c）×7.92
    2x+2x-1+2x-2+2x-3+2x-4+x=150
    3.5*ln(x-300)+ln(3)＝0
    15+(40−x)=1.5×(20+x)
    15+(40−x)=1.5×(20+x)
    8%*x+20%*(1-x)=15%
    (s^2+1)(s+5)=(s+4)((s^2+1)+2s(s+5))
    (s^2+1)(s^2+5)=(s+4)((s^2+1)+2s(s+5))
    x^4+4x^3+6x^2+4x+5=0
    2x^3+22x^2+35x-1=0
    s^3+3s^2+3s+1=0
    (x+2)(2x+7)
    0=(x+3)(x^2+2x+2)+x(x^2+2x+2)+x(x+3)(2x+2)
    510.52/(12827-X)=0.1
    510.52/(12827-X)=0.1
    133.42*x^3-255.86*x^2+857.39*x*0.5=180
    133.42*x^3-255.86*x^2+857.39*x*0.5=2100
    (4+x)²=

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