Mathematical Proof: wi is in the Span{v1,..,vr} for each I=1,..s, then proof Span{v1,..,vr} = Span{v1,..,vr, w1,..,ws}?

v1,..vr is a set of vector, similarly w1..ws is a set of vectors.

I have got this far:
c1v1+c2v2+crvr

Have no idea about this
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