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If the equation 2x^2+4x y+7y^2-12 x-2y+t...

If the equation `2x^2+4x y+7y^2-12 x-2y+t=0,w h e r et` is a parameter has exactly one real solution of hte form `(x ,y)` , then hte sum of `(x+y)` is equal to ______.

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