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PQ-PR + QR-PQ + PR - QR = Dicari yang sama Variabel nya
= PQ - PQ + PR - PR - QR-QR
= 0 0 0
= Kok gaada hasilnya dek :3
*Setauku ini dek caranya , maaf kalo kakak salah
=> pq-pr+qr-pq+pr-qr
=> 0 (tdak ada hasil karena semua sudah habis dikurangi)