(s^2+6s+10)+(s-1)(2s+6)=0
    x^4-3x^3-11x^2+15x+34=0
    x^3-5*x^2-x+17=0
    x^3-5x^2-x-17=0
    x^3-5x^2-x^-17=0
    x^4-11x^3+31x^2-9x=0
    0.008＝40X－9X²
    567=（（0.021*x^1.85+1603）^0.5）*x^0.84
    （25.851+x）×2.55＝51.702+69.853-x
    （25.851+x）×2.35＝51.702+69.853-x
    （25.851+x）×2.15＝51.702+69.853-x
    （25.851+x）×1.95＝51.702+69.853-x
    （25.851+x）×1.75＝51.702+69.853-x
    （25.851+x）×1.55＝51.702+69.853-x
    （1+x)*(1+2%)=1+2.5%
    x+0.75x-13625.8=0
    (s+2)(s^2+6s+25)+s(s^2+6s+25)+s(s+2)(2s+6)=0
    a^2=16a+64
    y*(0.019+y)/[(0.981-y)*(0.019-y)]=0.2826
    2/x+1/(x+20)=1/(x+2)

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