x/（215-x-0）＝0.2
    x/（385-x-18.06）＝0.2
    x/（385-x-18.06）＝0.3
    x/74-18=x/65
    （8-x）2=x
    （40-25-x）(400+5x)=4250
    1/3x/9=16/1/3x
    12589x^2+1000x-1=0
    12589.254x^2+1000x-1=0
    X*0.04=1870000
    X*0.4=1870000
    (10^4.1)*(x^2)+(10^3)*x-1=0
    10^4.1x^2+10^3x-1=0
    (10^4.1)x^2+(10^3)x-1=0
    x^2+(10^(-1.1))x-10^(-4.1)=0
    x^3-x-1
    x^2-32x+320=0
    1/10x+10=(x+10)*2/11
    （18000+8600X）÷2=66000+8600X-2417*10
    （180000+8600X）÷2=66000+8600X-2417X

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