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5x² + 6xy - 8y² - 2xy + 9y²
5x² + (6xy - 2xy) + (- 8y² + 9y²)
5x² + 4xy + y²
Yang nomor 2
8p²q² - p²q + 12pq + 5pq + 5p²q
8p²q² + (- p²q + 5p²q) + (12pq + 5pq)
8p²q² + 4p²q + 17pq