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Suppose that `vec p, vec q and vec r` are three non-coplanar vectors in `R^3`. Let the components of a vector `vec s` along `vec p, vec q and vec r` be 4, 3 and 5, respectively. If the components of this vector `vec s` along `(-vec p+vec q +vec r), (vec p-vec q+vec r) and (-vec p-vec q+vec r)` are x, y and z, respectively, then the value of `2vec x+vec y+vec z` is

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