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Yes.

Suppose x divides y then there exist an integer p such that y = px.

Suppose y divides z then there exist an integer q such that z = qy.

Therefore z = q*px = qp*x

Since p and q are integers then pq is an integer and therefore x divides z.

That is to say: if x divides y and y divides z, then x divides z.

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