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Simplify: (a) x + y + x + y. (b) 2a + b + 2a + b. (c) 3c + 4d + c + 3d. (d) 4m – n + 2m – n. (e) 5p – 3q + p + 2q. (f) 6x – 5y – x + 2y.
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