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Find the equation of the ellipse in the following case: focus is (-1,1) directirx is `x-y+3=0` and ` e=1/2`.

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focus is `(-1,1) ` directrix is `x-y+3=0` and ` e=1/2`
Focus is `(-1,1)`
Directrix is `x-y+3=0`
`e=1/2`
...
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