4[(2x-9)/3](15-2x)=40
    8/5x(15-2x)=40
    4x^2-30x+25=0
    (-0.2x)+3.8＝(x^2)-2x+2
    (-0.2x)+3.8＝(x^2)-2x+2
    (-0.2x)+3.8＝(x^2)-2x+2
    （-0.2x）+(19/5)＝((-x-4)^0.5)+2
    170*（1+X）^3=200
    113*（1+X）^3=140
    113*（1+X）^3=140
    2^x-x^2
    x^3-4x^2+2x-2=0
    x^3-4x^2+2x-2=0
    x^3-4x^2+2x-2=0
    x^3-4x^2+2x-2=0
    （30000:x）+（10000:（x+6.6））=150
    40000:x=150
    30000:x+10000:(x-6.6)=150
    2/3*((1-1/0.055)+(3/4+1/0.055)*(1/3*220/x*0.35805183739485175)^0.055) = 5.4293/x
    2/3*((1-1/0.055)+(3/4+1/0.055)*(1/3*220/x*0.35805183739485175)^0.055) = 5.4828/x

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