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First, we divide the RHS with w2, and then we put w2=0. However, we can only divide something which is nonzero. Don't you think the way you solved this particular numerical is contradictory?
First, we divide the RHS with w2, and then we put w2=0. However, we can only divide something which is nonzero. Don't you think the way you solved this particular numerical is contradictory?