1) (xy + 6a)+(6a – 2) - (8z + 10xy);

2)(4b - 3cd) - (11b +20k) + (23k - 19cd);

3) (2t - mn) + (8nm - 9k) - (-10k + 15z);

4) (1,8a - bc) + (7,7bc - d) - (10,1d - a).

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