Practice - Proofs with Partitioning: Example 1

Proofs - Proofs with Partioning: Example 1
[size=150]Why was Statement 2 valid?[/size]
[size=150]Why was Substitution used?[/size]
[size=150]Could the order of Statements 2 and 3 have been switched and still result in a valid proof?[/size]
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Information: Practice - Proofs with Partitioning: Example 1