20*x+10*1.2x=129081
    320/600*X=X-150
    x^2 + 8x + 8 = 0
    20*x+10*1.2x=98556
    3x^2 + 2x + 1 = 0
    145000000=13.8×200x(460-x/2)
    145000000=13.8×200x^2×（460-x/2）
    4x^3 + 24x^2 + 34x + 10 = 0
    20*x+10*1.2x=453944
    20*x+10*1.2x=850000
    21*x+10*1.2x=850000
    -15000+x-x*8%/4=4500
    0.92x/4=19500
    x-8%x/4=19500
    x-8%/4=19500
    x+5-1=
    x^3-1/6*x+1/12=0
    0.09x+x=340
    19*x+12*1.2x=850000
    18*x+13*1.2x=850000

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