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1. 4x + 6x - 6y - 3y = 10x - 9y
2. 2x - 12x - 5y + 9y = - 10x + 4y
(4x-6y) + (6x-3y)
4x - 6y + 6x - 3y
4x + 6x - 6y - 3y
10x - 9y
2.
2x - 5y - 12x + 9y
2x - 12x - 5y + 9y
-10x + 4y