-2x=-4
    336-2x=332
    -2x+336=332
    10x+12(28-x)=332
    -2X=4
    1.388888889=1.0405^n
    1.8=(1+x)^10
    [44300-(44300-30500)*0.13*1.12]=30500/x
    [x-(x-30500)*0.13*1.12]=44300
    [x-(x-8500)*0.13*1.12]=8500/0.72
    [x-(x-11000)*0.13*1.12]=11000/0.72
    [x-(x-30500)*0.13*1.12]=30500/0.72
    3E-15x^6 - 3E-11x^5 + 1E-07x^4 - 0.0002x^3 + 0.2249x^2 - 128.79x + 30615=0
    3E-15x^6 - 3E-11x^5 + 1E-07x^4 - 0.0002x^3 + 0.2249x^2 - 128.79x + 30615=0
    3E-15x6 - 3E-11x5 + 1E-07x4 - 0.0002x3 + 0.2249x2 - 128.79x + 30615=0
    e-1 = 3*10^-15*x^6 - 3*10^-11*x^5 + 1*10^-7*x^4 - 0.0002*x^3 + 0.2249*x^2 - 128.79*x + 30615
    【 x − ( x − 30500 ) × 0.13 】 = 30500/0.72
    [x-(x-30500)*0.13]=42360
    x^2*e^x+lnx=0
    2x^4-2x^3=0

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