x^2=9
    8x^2-33x+8=0
    14.711=（（0.021*x^1.85+557）^0.5）*x^0.84
    5.01=（（0.021*x^1.85+557）^0.5）*x^0.84
    (x-115.185)*10-2=1
    (x-122.617)*10-2=1
    x^2-6.7x+10.7=0
    （220*63-x）*0.95=11756
    （220*63-x）*0.85=11756
    (x-1000)/1000/-10%=-0.5
    （x-1000)/-10%=-0.5
    0.131/x＝0.1289/0.86289
    0.4/100.58＝x/32.95
    （26.326+x）×2.45＝52.652+71.028-x
    x^2- 12.3x+ 24.5=0
    x^2-13.7x+41.4=0
    56Q－（580＋40Q）－（56Q×13％－5Q）×12％
    (75x^4)÷4-(165x^3)÷2+(593x^2)÷4-129x+45=9x^4+(141x^2)÷4-27x^3-22.5x+25÷4
    x2-x+2
    1.8-8x/1.2-1.3-3x/1.2=5x-0.4/0.3

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