-4x+0.1(25000-x)=2480
    【（220+260）*63-x】*0.85=23916.45
    x-(x/1.01*0.01)-{（x-(x/1.01*0.01)）*0.8-(x/1.01*0.01*0.07/2)}*0.2-(x/1.01*0.01*0.07/2)=6400
    9.4=（（0.021*x^1.85+129）^0.5）*x^0.84
    1.235=（（0.021*x^1.85+129）^0.5）*x^0.84
    0.235=（（0.021*x^1.85+129）^0.5）*x^0.84
    11.515=（（0.021*x^1.85+129）^0.5）*x^0.84
    xlnx=50
    10.8×1000＝3×（1000x—100×562）÷（100＋x）÷1562
    10.8＝3×（1000x—100×562）÷（100＋x）÷1562
    85.52+1.88*x＝92.04+1.76*x
    （x-x/40） = 5600/0.95
    （x-x/40） = 8500/0.95
    x^2+arctanx=3
    x^3+7x^2-13x+16=0
    -x^2/2+x=122
    xlnx=50
    xlnx=5
    1000×6%/12+1500×8%/12+x×6%/12=0
    x^6+104x^4+104x^2-10000=0

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