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= 5p²q + 12p²q - 4p²q - 4pq² - 6pq² + 15p²q²
= 17p²q - 4p²q - 4pq² - 6pq² + 15p²q²
= 13p²q + 2pq² + 15p²q²
Insyaallah itu jawabannya...