7x+6x+14x+10.5x+3=42x
    D=1.13*（1/4）^1/2
    1.13x（1/4）^1/2
    x*0.5%=33.9
    -0.4x+0.1(25000-x)=2480
    -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

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