2a +2. (8a-6), 4. 2b + (8b + 3c) -5c, 5d-2d- (8e+6e), 3f. 5f+3f-2f, 9g + (97h + 593g)+256h, 2i + 3j-88i + 59j, 17k + (98k-81L) + 12L, 346x + (765x-257). (875x + 180).

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