2).Розкрийте дужки і зведіть подібні доданки:
1) 10а + (4 - 4а); 3) (с - 5d) - (-d + 5с);

2) -(46- 10) + (4- 56); 4)-(5n + m) + (-4n + 8m)-(2m-5n).
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