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Reduce each to its lowest terms. 1. 2. 3. 4. 3x 6x² 2x +4 2x-16 15a³b³ 20a4b4 35c² d² 42c³d² 5. 6. 7. 8. 5p + 5q 4p +4q 5m+m 6m(3m² + 1) 9p+9q 9p-9q 7a+ 7b a² - b² 72​