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What is the missing step in this proof? BAC ACB BDE DEB ADE DEC BAC BDE ABC DBE Proof: Statement Reason 1. given 2. Addition Property of Equality 3. using common denominators 4. AB = AD + DB CB = CE + EB segment addition 5. Substitution Property of Equality 6. ABC DBE Reflexive Property of Congruence 7. ABC ~ DBE SAS similarity criterion 8. Corresponding angles of similar triangles are congruent. 9. || If the corresponding angles formed by two lines cut by a transversal are congruent, then the lines are parallel.

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