s(s-3)=(s+1)(2s-3)
    3s^2*(s^3+4s^2+5s+2)=s^3(3s^2+8s+5)
    s^3+4s^2+5s+2=0
    30*（390-a）-9a=7410
    1.2a+0.88（80-a）=80
    2X²-3X-1＝0
     x+2x+(x+2x-15)=65
    3x+2x+(x+2x-15)=65
    （175/9）x^4+20x^3-374x^2+1620x-2025=0
    (X-60)(220-2X)＝1200
    (X-60)(220-2X)＝1050
    (X-60)*(200-2X)＝1030
    112.8=（（0.021*x^1.85+1603）^0.5）*x^0.84
    （26.326+x）×2.55＝71.278+52.652-x
    （26.326+x）×2.35＝71.278+52.652-x
    （26.326+x）×2.15＝71.278+52.652-x
    （26.326+x）×1.95＝71.278+52.652-x
    （26.326+x）×1.75＝71.278+52.652-x
    （26.326+x）×1.55＝71.278+52.652-x
    （2x-1）÷3=x-2

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