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Let a,b and vec(c) be non-coplanar vecto...

Let a,b and `vec(c)` be non-coplanar vectors and `vecalpha=a+2b+3c,vecbeta=2veca+vecb-2vec(c) and vec(gamma)=3veca-7vec(c)`, then find `[vec(alpha)" "vec(beta)" "vec(gamma)]`:

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