The following vectors form an orthogonal basis for Rª. V₁ = (1,-1,2,-1), V₂ = (-2,2,3,2) V3 = (1,2,0,-1), v4 = (1,0,0,1) Let w = (1,7,1,–9). Find the value of c if w = av₁ + bv2 + CV3 + dv4.

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