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Solve x^(-2)+2x^(-1)-3=0...

Solve `x^(-2)+2x^(-1)-3=0`

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`t^2+2t-3=0` where t=1/x
`(t+1)^2=4`
t+1=+-2 or t= -1+-2
`implies t=-3` or 1
i.e. 1/x=-3 or 1
`implies x=1/-3` or 1
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