Subtract 5xsquare+9ysquare-3zsquare from the sum of 6xsquare-5ysquare and ysquare+5zsquare
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6x^2-5y^2+y^2+5z^2=6x^2-4y^2+y^2
5x^2+ 9y^2- 3z^2 - 6x^2-4y^2+y^2
=-1x^2+6y^2-3z^2
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