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= 2p² -6pq +p² -3pq +pq -3q²
= 2p² +p² -6pq -3pq +pq -3q²
= 3p² -8pq -3q²
Itu jawabannya.
2p²-6pq+(p²-3pq+pq-3q²)
2p²-6pq+p²-2pq-3q²
3p²-8pq-3q²