2x×x=1
    53-3x=14
    2x^3-50x+45＝0
    x^2x
    x^4-3x^2+4x-5=0
    x×(1+20%) = 24
    x×(1+20%) = 24
    x×(1+20%)
    200+0.6y+40
    0.0578x-0.0003x²=1.957
    0.578x-0.0003x²=1.957
    0.578x+0.0003x²=1.957
    0.578x-0.003x²=1.957
    1/x-sin(1/x)
    2x*x*x-5x*x+4x＝1
    1000/x -190=1000/(x+95)
    9/50x-13/100x=1/20x
    9/50x-13/100
    18%x+13%（1-x）=16%
    e^x+3.44x=1.10

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