2/3^1/x
    1.76×10^(-5)=(101.88×10^(-3)-x)(1.88×10^(-3)-x)/(0.18+x)
    （1+x）*e^x=10/3*10^9
    x^2-3x+1=0
    （0.002-x）^2（0.059-x）=5.61×10^(-12)
    5a-4
    2x²+6x
    -0.5x+6=x
    3-y/2=6
    5x=2x+9
    x/1.07+x/1.1449=100
    3t-0.5t+10t=5×6-5
    -3x+1/2x=5-7
    sinx/（2-cos2*x）
    3x^2=4
    178x^2+169x+31=0
    x×x-140x＋900＝0
    x^2-0.31x+0.02=0
    7x²＋12x＋4＝0
    x^2-0.312x+0.02=0

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