зведіть подібні доданки:
1)8x - 7x - 19x +21x
2)-9y + 12y - 41y - 17y
3)2,6a - 5,4b - a + 2b
4) -5,6t + 4,8 + 8,2t- 9,1
5)4,6m + 8,3n - 5,1 - 8,3m - 6,4n
6) -3 2\3 a + 5 5\6b - 2 1\8a - 3 7\12b
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