Find the value of x in the quadratic equation \(\frac{m}{n}x^2+\frac{n}{m}=1-2x\)

1
1
2
\({-2n \pm \sqrt{3mn} \over 2m}\)
3
\({-m \pm \sqrt{mn} \over n}\)
4
\({-n \pm \sqrt{mn} \over m}\)

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