7X/8-2X/3=7+1+1/3
    5/6-(X-2/3)=1/3
    80*(23-X)+80X*(1-5%)+80X*(1-15%)=2400
    80X+80X*(1-5%)+80X*(1-15%)=2400
    （（23-X）*80*（1-5%））+（X*（80*（1-15%）））=2400
    （（23-X）*80*（1-5%））+（80X*（1-15%））=2400
    （40.221+x）×1.35＝40.221+71.242-x
    （40.211+x）×1.15＝40.221+71.242-x
    a+a*0.06=181260
    a+0.2a+((0.2a+a)*0.2)+((a+0.2a)+(a+0.2a+((0.2a+a)*0.2))*0.06=181260
    (a×0.2+a)×0.2+(a×0.2)+a+((a×0.2+a)×0.2+(a×0.2)+a)×0.6=181260
    (a×0.2+a)×0.2+(a×0.2)+a+((a×0.2+a)×0.2+(a×0.2)+a)×0.6=171000
    (a×0.2+a)×0.2+(a×0.2)+a=171000
    (a*20%+a)*20%+a*20%=171000
    (a*20%+a)*20%=171000
    (a*20%+(a*20%+a))*20%=171000
    17600/x+10000/(x+20)=150
    17600÷x+10000/(x+20)=3
    -0.5=0.0118*X-0.000118*X^2+0.000267*X*28+28*0.000000839*X^2
    -0.5=0.0118*X-0.000118*X^2+0.000267*X*28+0.000000839*X^2*28

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