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Suppose that `vec(p), vec(q) and vec(r)` are three non-coplanar vectors in R. 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 `2x + y + z` is

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