-4+（-4x）=0
    X = 100+0.2X+0.1X+0.13X
     X = 100+0.1X+0.1X+0.13X
    0=X*912-X*12-1200-560*X
    X=100+0.2X+0.2X+0.13X
    X=100+0.2X+0.3X
    （3x+2）/4=2x-7
    X=100+0.2X+0.1X
    X=100+0.2X+10
    （3x+2）/4=2x-7
    X=100+0.2X+0.2X
    x=1000*0.3x
    x/（100-x）＾2=6.06
    x/（100-x）＾2=6.06
    x=84842.5+(x*1.33%)
    12445＝130x+50（151-x）-225
    12445＝130x+50（151-x）
    12445＝130x+50x
    4x＋2×12
    (156+292.5)/30*x+240/30*(x+15)+120/30*(x+30)=1910

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