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= 2b² + 2ab - 3a - a²
2. 7A = 13x + y
-8B = 8x - 9y
6A + 10B = 6(13x + y)/7 + 10(8x - 9y)/-8
= 48(13x + y)/56 - 70(8x - 9y)/56
= (624x - 560x + 48y + 630y)/56
= (64x + 678y)/56