Зведіть подібні доданки:
1) -4а + 12а + 13а – 27а;
2) 4,2х – 4,8х - 6,3х – 2,4х;
3) -17х + 19y - 15y + 13x;
4) 0,9n - 0,8м – 0,7m + 3,5n - 1,9n.
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