((X+20)/(1-0.004))*0.004=2000
    （1+1.5x）*（1.63x+0.957）=2.63*2.5x
    （1+1.5x）*（1.63x+0.957）=2.6*2.5x
    3x2十8x
    -1/2x^2+1/3x+8/3=0
    4x^3-6x^2+4x-1=0
    （40-x-30）（200x+600）=8400
    x -(26+8+0. 02x)=0. 1x
    X[（1-2X）/2]=0.06
    X（1-2X/2）=0.06
    x^2-16.6x+66.6=x
    e(0.0148/(0.07+2*x))=(0.07+2*x)/0.07
    （0.07+2*x）*ln（（0.07+2*x）/0.07）=0.0148
    100=x^6+1.04x^3+x^2
    16x^2+1=4x^8+5x^6+x^4
    （26.326+x）×0.85＝52.652+71.778-x
    （26.326+x）×0.85＝52.652+72.778-x
    （26.326+x）×0.85＝52.652+73.778-x
    （26.326+x）×0.85＝52.652+74.778-x
    （26.326+x）×0.85＝52.652+75.778-x

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