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STATEMENTS
1. PQ = RS
2. PQ+ QR = RS + QR
3. PQ+OR= PR
4. RS+ QR = QS
5. PR = QS

REASONS
1. Given
2. Addition prop.
3. Segment Addition Postulate (Post. 1.2)
4. Segment Addition Postulate (Post. 1.2)
5.