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The equation $5x^2+9y^2+10x-36y-4=0$ represents

1. an ellipse with the coordinates of foci being $(\pm3,0)$
2. a hyperbola with the coordinates of foci being $(\pm3,0)$
3. an ellipse with the coordinates of foci being $(\pm2,0)$
4. a hyperbola with the coordinates of foci being $(\pm2,0)$
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It represents an ellipse